Vulnerability Details CVE-2021-40823
A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 49.3%
CVSS Severity
CVSS v3 Score 5.9
CVSS v2 Score 4.3
References
Products affected by CVE-2021-40823
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cpe:2.3:a:matrix:javascript_sdk:-
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cpe:2.3:a:matrix:javascript_sdk:0.1.0
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cpe:2.3:a:matrix:javascript_sdk:0.1.1
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cpe:2.3:a:matrix:javascript_sdk:0.10.0
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cpe:2.3:a:matrix:javascript_sdk:0.10.1
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cpe:2.3:a:matrix:javascript_sdk:0.10.2
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cpe:2.3:a:matrix:javascript_sdk:0.10.3
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cpe:2.3:a:matrix:javascript_sdk:0.10.4
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cpe:2.3:a:matrix:javascript_sdk:0.10.5
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cpe:2.3:a:matrix:javascript_sdk:0.10.6
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cpe:2.3:a:matrix:javascript_sdk:0.10.7
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cpe:2.3:a:matrix:javascript_sdk:0.10.8
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cpe:2.3:a:matrix:javascript_sdk:0.10.9
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cpe:2.3:a:matrix:javascript_sdk:0.11.0
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cpe:2.3:a:matrix:javascript_sdk:0.11.1
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cpe:2.3:a:matrix:javascript_sdk:0.12.0
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cpe:2.3:a:matrix:javascript_sdk:0.12.1
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cpe:2.3:a:matrix:javascript_sdk:0.13.0
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cpe:2.3:a:matrix:javascript_sdk:0.13.1
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cpe:2.3:a:matrix:javascript_sdk:0.14.0
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cpe:2.3:a:matrix:javascript_sdk:0.14.1
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cpe:2.3:a:matrix:javascript_sdk:0.14.2
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cpe:2.3:a:matrix:javascript_sdk:0.14.3
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cpe:2.3:a:matrix:javascript_sdk:0.2.0
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cpe:2.3:a:matrix:javascript_sdk:0.2.1
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cpe:2.3:a:matrix:javascript_sdk:0.2.2
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cpe:2.3:a:matrix:javascript_sdk:0.3.0
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cpe:2.3:a:matrix:javascript_sdk:0.4.0
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cpe:2.3:a:matrix:javascript_sdk:0.4.1
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cpe:2.3:a:matrix:javascript_sdk:0.4.2
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cpe:2.3:a:matrix:javascript_sdk:0.5.0
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cpe:2.3:a:matrix:javascript_sdk:0.5.1
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cpe:2.3:a:matrix:javascript_sdk:0.5.2
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cpe:2.3:a:matrix:javascript_sdk:0.5.3
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cpe:2.3:a:matrix:javascript_sdk:0.5.4
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cpe:2.3:a:matrix:javascript_sdk:0.5.5
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cpe:2.3:a:matrix:javascript_sdk:0.5.6
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cpe:2.3:a:matrix:javascript_sdk:0.6.0
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cpe:2.3:a:matrix:javascript_sdk:0.6.1
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cpe:2.3:a:matrix:javascript_sdk:0.6.2
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cpe:2.3:a:matrix:javascript_sdk:0.6.3
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cpe:2.3:a:matrix:javascript_sdk:0.6.4
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cpe:2.3:a:matrix:javascript_sdk:0.7.0
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cpe:2.3:a:matrix:javascript_sdk:0.7.1
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cpe:2.3:a:matrix:javascript_sdk:0.7.10
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cpe:2.3:a:matrix:javascript_sdk:0.7.11
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cpe:2.3:a:matrix:javascript_sdk:0.7.12
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cpe:2.3:a:matrix:javascript_sdk:0.7.13
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cpe:2.3:a:matrix:javascript_sdk:0.7.2
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cpe:2.3:a:matrix:javascript_sdk:0.7.3
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cpe:2.3:a:matrix:javascript_sdk:0.7.4
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cpe:2.3:a:matrix:javascript_sdk:0.7.5
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cpe:2.3:a:matrix:javascript_sdk:0.7.6
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cpe:2.3:a:matrix:javascript_sdk:0.7.7
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cpe:2.3:a:matrix:javascript_sdk:0.7.8
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cpe:2.3:a:matrix:javascript_sdk:0.7.9
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cpe:2.3:a:matrix:javascript_sdk:0.8.0
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cpe:2.3:a:matrix:javascript_sdk:0.8.1
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cpe:2.3:a:matrix:javascript_sdk:0.8.2
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cpe:2.3:a:matrix:javascript_sdk:0.8.3
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cpe:2.3:a:matrix:javascript_sdk:0.8.4
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cpe:2.3:a:matrix:javascript_sdk:0.8.5
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cpe:2.3:a:matrix:javascript_sdk:0.9.0
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cpe:2.3:a:matrix:javascript_sdk:0.9.1
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cpe:2.3:a:matrix:javascript_sdk:0.9.2
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cpe:2.3:a:matrix:javascript_sdk:1.0.0
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cpe:2.3:a:matrix:javascript_sdk:1.0.1
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cpe:2.3:a:matrix:javascript_sdk:1.0.2
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cpe:2.3:a:matrix:javascript_sdk:1.0.3
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cpe:2.3:a:matrix:javascript_sdk:1.0.4
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cpe:2.3:a:matrix:javascript_sdk:1.1.0
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cpe:2.3:a:matrix:javascript_sdk:1.2.0
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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:2.0.0
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cpe:2.3:a:matrix:javascript_sdk:2.0.1
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cpe:2.3:a:matrix:javascript_sdk:2.1.0
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cpe:2.3:a:matrix:javascript_sdk:2.1.1
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cpe:2.3:a:matrix:javascript_sdk:2.2.0
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cpe:2.3:a:matrix:javascript_sdk:2.3.0
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cpe:2.3:a:matrix:javascript_sdk:2.3.1
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cpe:2.3:a:matrix:javascript_sdk:2.3.2
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cpe:2.3:a:matrix:javascript_sdk:2.4.0
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cpe:2.3:a:matrix:javascript_sdk:2.4.1
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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