Vulnerability Details CVE-2021-44538
The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.014
EPSS Ranking 79.6%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 7.5
Products affected by CVE-2021-44538
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cpe:2.3:a:cinny_project:cinny:1.0.0
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cpe:2.3:a:cinny_project:cinny:1.1.0
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cpe:2.3:a:cinny_project:cinny:1.2.0
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cpe:2.3:a:cinny_project:cinny:1.2.1
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cpe:2.3:a:cinny_project:cinny:1.3.0
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cpe:2.3:a:cinny_project:cinny:1.3.1
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cpe:2.3:a:cinny_project:cinny:1.3.2
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cpe:2.3:a:cinny_project:cinny:1.4.0
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cpe:2.3:a:cinny_project:cinny:1.5.0
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cpe:2.3:a:cinny_project:cinny:1.5.1
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cpe:2.3:a:matrix:element:0.0.2
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cpe:2.3:a:matrix:element:0.1.0
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cpe:2.3:a:matrix:element:0.1.1
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cpe:2.3:a:matrix:element:0.1.2
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cpe:2.3:a:matrix:element:0.10.0
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cpe:2.3:a:matrix:element:0.10.1
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cpe:2.3:a:matrix:element:0.10.2
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cpe:2.3:a:matrix:element:0.11.0
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cpe:2.3:a:matrix:element:0.11.1
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cpe:2.3:a:matrix:element:0.11.2
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cpe:2.3:a:matrix:element:0.11.3
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cpe:2.3:a:matrix:element:0.11.4
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cpe:2.3:a:matrix:element:0.12.0
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cpe:2.3:a:matrix:element:0.12.1
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cpe:2.3:a:matrix:element:0.12.2
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cpe:2.3:a:matrix:element:0.12.3
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cpe:2.3:a:matrix:element:0.12.4
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cpe:2.3:a:matrix:element:0.12.5
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cpe:2.3:a:matrix:element:0.12.6
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cpe:2.3:a:matrix:element:0.12.7
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cpe:2.3:a:matrix:element:0.13.0
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cpe:2.3:a:matrix:element:0.13.1
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cpe:2.3:a:matrix:element:0.13.2
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cpe:2.3:a:matrix:element:0.13.3
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cpe:2.3:a:matrix:element:0.13.4
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cpe:2.3:a:matrix:element:0.13.5
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cpe:2.3:a:matrix:element:0.14.0
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cpe:2.3:a:matrix:element:0.14.1
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cpe:2.3:a:matrix:element:0.14.2
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cpe:2.3:a:matrix:element:0.14.3
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cpe:2.3:a:matrix:element:0.15.0
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cpe:2.3:a:matrix:element:0.15.1
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cpe:2.3:a:matrix:element:0.15.2
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cpe:2.3:a:matrix:element:0.15.3
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cpe:2.3:a:matrix:element:0.15.4
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cpe:2.3:a:matrix:element:0.15.5
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cpe:2.3:a:matrix:element:0.15.6
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cpe:2.3:a:matrix:element:0.15.7
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cpe:2.3:a:matrix:element:0.16.0
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cpe:2.3:a:matrix:element:0.16.1
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cpe:2.3:a:matrix:element:0.16.2
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cpe:2.3:a:matrix:element:0.16.3
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cpe:2.3:a:matrix:element:0.16.5
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cpe:2.3:a:matrix:element:0.16.6
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cpe:2.3:a:matrix:element:0.17.0
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cpe:2.3:a:matrix:element:0.17.1
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cpe:2.3:a:matrix:element:0.17.2
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cpe:2.3:a:matrix:element:0.17.3
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cpe:2.3:a:matrix:element:0.17.4
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cpe:2.3:a:matrix:element:0.17.5
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cpe:2.3:a:matrix:element:0.17.6
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cpe:2.3:a:matrix:element:0.17.7
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cpe:2.3:a:matrix:element:0.17.8
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cpe:2.3:a:matrix:element:0.17.9
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cpe:2.3:a:matrix:element:0.2.0
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cpe:2.3:a:matrix:element:0.3.0
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cpe:2.3:a:matrix:element:0.4.0
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cpe:2.3:a:matrix:element:0.4.1
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cpe:2.3:a:matrix:element:0.5.0
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cpe:2.3:a:matrix:element:0.6.0
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cpe:2.3:a:matrix:element:0.6.1
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cpe:2.3:a:matrix:element:0.7.0
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cpe:2.3:a:matrix:element:0.7.1
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cpe:2.3:a:matrix:element:0.7.2
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cpe:2.3:a:matrix:element:0.7.3
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cpe:2.3:a:matrix:element:0.7.4
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cpe:2.3:a:matrix:element:0.7.5
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cpe:2.3:a:matrix:element:0.8.0
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cpe:2.3:a:matrix:element:0.8.1
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cpe:2.3:a:matrix:element:0.8.2
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cpe:2.3:a:matrix:element:0.8.3
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cpe:2.3:a:matrix:element:0.8.4
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cpe:2.3:a:matrix:element:0.9.0
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cpe:2.3:a:matrix:element:0.9.1
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cpe:2.3:a:matrix:element:0.9.10
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cpe:2.3:a:matrix:element:0.9.2
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cpe:2.3:a:matrix:element:0.9.3
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cpe:2.3:a:matrix:element:0.9.4
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cpe:2.3:a:matrix:element:0.9.5
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cpe:2.3:a:matrix:element:0.9.6
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cpe:2.3:a:matrix:element:0.9.7
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cpe:2.3:a:matrix:element:0.9.8
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cpe:2.3:a:matrix:element:0.9.9
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cpe:2.3:a:matrix:element:1.0.0
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cpe:2.3:a:matrix:element:1.0.1
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cpe:2.3:a:matrix:element:1.0.2
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cpe:2.3:a:matrix:element:1.0.3
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cpe:2.3:a:matrix:element:1.0.4
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cpe:2.3:a:matrix:element:1.0.5
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cpe:2.3:a:matrix:element:1.0.6
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cpe:2.3:a:matrix:element:1.0.7
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cpe:2.3:a:matrix:element:1.0.8
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cpe:2.3:a:matrix:element:1.1.0
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cpe:2.3:a:matrix:element:1.1.1
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cpe:2.3:a:matrix:element:1.1.2
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cpe:2.3:a:matrix:element:1.2.0
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cpe:2.3:a:matrix:element:1.2.1
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cpe:2.3:a:matrix:element:1.2.2
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cpe:2.3:a:matrix:element:1.2.3
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cpe:2.3:a:matrix:element:1.2.4
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cpe:2.3:a:matrix:element:1.3.0
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cpe:2.3:a:matrix:element:1.3.1
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cpe:2.3:a:matrix:element:1.3.2
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cpe:2.3:a:matrix:element:1.3.3
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cpe:2.3:a:matrix:element:1.3.4
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cpe:2.3:a:matrix:element:1.3.5
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cpe:2.3:a:matrix:element:1.3.6
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cpe:2.3:a:matrix:element:1.4.0
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cpe:2.3:a:matrix:element:1.4.1
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cpe:2.3:a:matrix:element:1.4.2
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cpe:2.3:a:matrix:element:1.5.0
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cpe:2.3:a:matrix:element:1.5.1
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cpe:2.3:a:matrix:element:1.5.10
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cpe:2.3:a:matrix:element:1.5.11
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cpe:2.3:a:matrix:element:1.5.12
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cpe:2.3:a:matrix:element:1.5.13
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cpe:2.3:a:matrix:element:1.5.14
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cpe:2.3:a:matrix:element:1.5.15
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cpe:2.3:a:matrix:element:1.5.16
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cpe:2.3:a:matrix:element:1.5.2
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cpe:2.3:a:matrix:element:1.5.3
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cpe:2.3:a:matrix:element:1.5.4
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cpe:2.3:a:matrix:element:1.5.5
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cpe:2.3:a:matrix:element:1.5.6
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cpe:2.3:a:matrix:element:1.5.7
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cpe:2.3:a:matrix:element:1.5.8
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cpe:2.3:a:matrix:element:1.5.9
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cpe:2.3:a:matrix:element:1.6.0
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cpe:2.3:a:matrix:element:1.6.1
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cpe:2.3:a:matrix:element:1.6.2
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cpe:2.3:a:matrix:element:1.6.3
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cpe:2.3:a:matrix:element:1.6.4
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cpe:2.3:a:matrix:element:1.6.5
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cpe:2.3:a:matrix:element:1.6.6
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cpe:2.3:a:matrix:element:1.6.7
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cpe:2.3:a:matrix:element:1.6.8
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cpe:2.3:a:matrix:element:1.7.0
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cpe:2.3:a:matrix:element:1.7.1
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cpe:2.3:a:matrix:element:1.7.10
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cpe:2.3:a:matrix:element:1.7.11
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cpe:2.3:a:matrix:element:1.7.12
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cpe:2.3:a:matrix:element:1.7.13
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cpe:2.3:a:matrix:element:1.7.14
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cpe:2.3:a:matrix:element:1.7.15
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cpe:2.3:a:matrix:element:1.7.16
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cpe:2.3:a:matrix:element:1.7.17
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cpe:2.3:a:matrix:element:1.7.18
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cpe:2.3:a:matrix:element:1.7.19
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cpe:2.3:a:matrix:element:1.7.2
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cpe:2.3:a:matrix:element:1.7.20
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cpe:2.3:a:matrix:element:1.7.21
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cpe:2.3:a:matrix:element:1.7.22
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cpe:2.3:a:matrix:element:1.7.23
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cpe:2.3:a:matrix:element:1.7.24
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cpe:2.3:a:matrix:element:1.7.24.1
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cpe:2.3:a:matrix:element:1.7.25
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cpe:2.3:a:matrix:element:1.7.26
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cpe:2.3:a:matrix:element:1.7.27
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cpe:2.3:a:matrix:element:1.7.28
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cpe:2.3:a:matrix:element:1.7.29
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cpe:2.3:a:matrix:element:1.7.3
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cpe:2.3:a:matrix:element:1.7.30
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cpe:2.3:a:matrix:element:1.7.31
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cpe:2.3:a:matrix:element:1.7.32
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cpe:2.3:a:matrix:element:1.7.33
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cpe:2.3:a:matrix:element:1.7.34
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cpe:2.3:a:matrix:element:1.7.4
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cpe:2.3:a:matrix:element:1.7.5
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cpe:2.3:a:matrix:element:1.7.6
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cpe:2.3:a:matrix:element:1.7.7
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cpe:2.3:a:matrix:element:1.7.8
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cpe:2.3:a:matrix:element:1.7.9
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cpe:2.3:a:matrix:element:1.8.0
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cpe:2.3:a:matrix:element:1.8.1
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cpe:2.3:a:matrix:element:1.8.2
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cpe:2.3:a:matrix:element:1.8.3
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cpe:2.3:a:matrix:element:1.8.4
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cpe:2.3:a:matrix:element:1.8.5
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cpe:2.3:a:matrix:element:1.8.6
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cpe:2.3:a:matrix:element:1.9.0
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cpe:2.3:a:matrix:element:1.9.1
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cpe:2.3:a:matrix:element:1.9.2
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cpe:2.3:a:matrix:element:1.9.3
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cpe:2.3:a:matrix:element:1.9.4
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cpe:2.3:a:matrix:element:1.9.5
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cpe:2.3:a:matrix:element:1.9.6
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cpe:2.3:a:matrix:javascript_sdk:10.0.0
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cpe:2.3:a:matrix:javascript_sdk:10.1.0
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cpe:2.3:a:matrix:javascript_sdk:11.0.0
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cpe:2.3:a:matrix:javascript_sdk:11.1.0
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cpe:2.3:a:matrix:javascript_sdk:11.2.0
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cpe:2.3:a:matrix:javascript_sdk:12.0.0
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cpe:2.3:a:matrix:javascript_sdk:12.0.1
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cpe:2.3:a:matrix:javascript_sdk:12.1.0
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cpe:2.3:a:matrix:javascript_sdk:12.2.0
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cpe:2.3:a:matrix:javascript_sdk:12.3.0
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cpe:2.3:a:matrix:javascript_sdk:12.4.0
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cpe:2.3:a:matrix:javascript_sdk:12.5.0
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cpe:2.3:a:matrix:javascript_sdk:13.0.0
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cpe:2.3:a:matrix:javascript_sdk:14.0.0
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cpe:2.3:a:matrix:javascript_sdk:14.0.1
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cpe:2.3:a:matrix:javascript_sdk:15.0.0
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cpe:2.3:a:matrix:javascript_sdk:15.1.0
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cpe:2.3:a:matrix:javascript_sdk:15.1.1
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cpe:2.3:a:matrix:javascript_sdk:15.2.0
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cpe:2.3:a:matrix:javascript_sdk:2.4.2
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cpe:2.3:a:matrix:javascript_sdk:2.4.3
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cpe:2.3:a:matrix:javascript_sdk:2.4.4
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cpe:2.3:a:matrix:javascript_sdk:2.4.5
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cpe:2.3:a:matrix:javascript_sdk:2.4.6
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cpe:2.3:a:matrix:javascript_sdk:3.0.0
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cpe:2.3:a:matrix:javascript_sdk:4.0.0
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cpe:2.3:a:matrix:javascript_sdk:5.0.0
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cpe:2.3:a:matrix:javascript_sdk:5.0.1
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cpe:2.3:a:matrix:javascript_sdk:5.1.0
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cpe:2.3:a:matrix:javascript_sdk:5.1.1
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cpe:2.3:a:matrix:javascript_sdk:5.2.0
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cpe:2.3:a:matrix:javascript_sdk:5.3.0
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cpe:2.3:a:matrix:javascript_sdk:5.3.1
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cpe:2.3:a:matrix:javascript_sdk:6.0.0
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cpe:2.3:a:matrix:javascript_sdk:6.1.0
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cpe:2.3:a:matrix:javascript_sdk:6.2.0
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cpe:2.3:a:matrix:javascript_sdk:6.2.1
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cpe:2.3:a:matrix:javascript_sdk:6.2.2
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cpe:2.3:a:matrix:javascript_sdk:7.0.0
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cpe:2.3:a:matrix:javascript_sdk:7.1.0
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cpe:2.3:a:matrix:javascript_sdk:8.0.0
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cpe:2.3:a:matrix:javascript_sdk:8.0.1
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cpe:2.3:a:matrix:javascript_sdk:8.1.0
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cpe:2.3:a:matrix:javascript_sdk:8.2.0
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cpe:2.3:a:matrix:javascript_sdk:8.3.0
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cpe:2.3:a:matrix:javascript_sdk:8.4.0
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cpe:2.3:a:matrix:javascript_sdk:8.4.1
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cpe:2.3:a:matrix:javascript_sdk:8.5.0
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cpe:2.3:a:matrix:javascript_sdk:9.0.0
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cpe:2.3:a:matrix:javascript_sdk:9.0.1
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cpe:2.3:a:matrix:javascript_sdk:9.1.0
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cpe:2.3:a:matrix:javascript_sdk:9.10.0
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cpe:2.3:a:matrix:javascript_sdk:9.11.0
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cpe:2.3:a:matrix:javascript_sdk:9.2.0
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cpe:2.3:a:matrix:javascript_sdk:9.3.0
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cpe:2.3:a:matrix:javascript_sdk:9.4.0
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cpe:2.3:a:matrix:javascript_sdk:9.4.1
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cpe:2.3:a:matrix:javascript_sdk:9.5.0
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cpe:2.3:a:matrix:javascript_sdk:9.5.1
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cpe:2.3:a:matrix:javascript_sdk:9.6.0
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cpe:2.3:a:matrix:javascript_sdk:9.7.0
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cpe:2.3:a:matrix:javascript_sdk:9.8.0
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cpe:2.3:a:matrix:javascript_sdk:9.9.0
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cpe:2.3:a:matrix:olm:3.1.4
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cpe:2.3:a:matrix:olm:3.1.5
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cpe:2.3:a:matrix:olm:3.2.0
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cpe:2.3:a:matrix:olm:3.2.1
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cpe:2.3:a:matrix:olm:3.2.2
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cpe:2.3:a:matrix:olm:3.2.3
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cpe:2.3:a:matrix:olm:3.2.4
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cpe:2.3:a:matrix:olm:3.2.5
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cpe:2.3:a:matrix:olm:3.2.6
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cpe:2.3:a:matrix:olm:3.2.7
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cpe:2.3:a:schildi:schildichat:1.7.12
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cpe:2.3:a:schildi:schildichat:1.7.13
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cpe:2.3:a:schildi:schildichat:1.7.14
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cpe:2.3:a:schildi:schildichat:1.7.15
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cpe:2.3:a:schildi:schildichat:1.7.16
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cpe:2.3:a:schildi:schildichat:1.7.17-sc1
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cpe:2.3:a:schildi:schildichat:1.7.20-sc1
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cpe:2.3:a:schildi:schildichat:1.7.22-sc1
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cpe:2.3:a:schildi:schildichat:1.7.24-sc1
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cpe:2.3:a:schildi:schildichat:1.7.29-sc1
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cpe:2.3:a:schildi:schildichat:1.7.32-sc1
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cpe:2.3:a:schildi:schildichat:1.7.8
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cpe:2.3:a:schildi:schildichat:1.8.4-sc1
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cpe:2.3:a:schildi:schildichat:1.8.5-sc1
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cpe:2.3:a:schildi:schildichat:1.9.0-sc.1
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cpe:2.3:a:schildi:schildichat:1.9.5-sc.2
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cpe:2.3:a:schildi:schildichat:1.9.7-sc.1
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cpe:2.3:o:debian:debian_linux:10.0
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cpe:2.3:o:debian:debian_linux:11.0
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cpe:2.3:o:debian:debian_linux:9.0