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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-21394

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. Refer to referenced GitHub security advisory for additional details including workarounds.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 65.6%
CVSS Severity
CVSS v3 Score 5.3
CVSS v2 Score 4.0
Products affected by CVE-2021-21394
  • Matrix » Synapse » Version: 0.17.1
    cpe:2.3:a:matrix:synapse:0.17.1
  • Matrix » Synapse » Version: 0.17.2
    cpe:2.3:a:matrix:synapse:0.17.2
  • Matrix » Synapse » Version: 0.17.3
    cpe:2.3:a:matrix:synapse:0.17.3
  • Matrix » Synapse » Version: 0.18.0
    cpe:2.3:a:matrix:synapse:0.18.0
  • Matrix » Synapse » Version: 0.18.1
    cpe:2.3:a:matrix:synapse:0.18.1
  • Matrix » Synapse » Version: 0.18.2
    cpe:2.3:a:matrix:synapse:0.18.2
  • Matrix » Synapse » Version: 0.18.3
    cpe:2.3:a:matrix:synapse:0.18.3
  • Matrix » Synapse » Version: 0.18.4
    cpe:2.3:a:matrix:synapse:0.18.4
  • Matrix » Synapse » Version: 0.18.5
    cpe:2.3:a:matrix:synapse:0.18.5
  • Matrix » Synapse » Version: 0.18.6
    cpe:2.3:a:matrix:synapse:0.18.6
  • Matrix » Synapse » Version: 0.18.7
    cpe:2.3:a:matrix:synapse:0.18.7
  • Matrix » Synapse » Version: 0.19.0
    cpe:2.3:a:matrix:synapse:0.19.0
  • Matrix » Synapse » Version: 0.19.1
    cpe:2.3:a:matrix:synapse:0.19.1
  • Matrix » Synapse » Version: 0.19.2
    cpe:2.3:a:matrix:synapse:0.19.2
  • Matrix » Synapse » Version: 0.19.3
    cpe:2.3:a:matrix:synapse:0.19.3
  • Matrix » Synapse » Version: 0.20.0
    cpe:2.3:a:matrix:synapse:0.20.0
  • Matrix » Synapse » Version: 0.21.0
    cpe:2.3:a:matrix:synapse:0.21.0
  • Matrix » Synapse » Version: 0.21.1
    cpe:2.3:a:matrix:synapse:0.21.1
  • Matrix » Synapse » Version: 0.22.0
    cpe:2.3:a:matrix:synapse:0.22.0
  • Matrix » Synapse » Version: 0.22.1
    cpe:2.3:a:matrix:synapse:0.22.1
  • Matrix » Synapse » Version: 0.23.0
    cpe:2.3:a:matrix:synapse:0.23.0
  • Matrix » Synapse » Version: 0.23.1
    cpe:2.3:a:matrix:synapse:0.23.1
  • Matrix » Synapse » Version: 0.24.0
    cpe:2.3:a:matrix:synapse:0.24.0
  • Matrix » Synapse » Version: 0.24.1
    cpe:2.3:a:matrix:synapse:0.24.1
  • Matrix » Synapse » Version: 0.25.0
    cpe:2.3:a:matrix:synapse:0.25.0
  • Matrix » Synapse » Version: 0.25.1
    cpe:2.3:a:matrix:synapse:0.25.1
  • Matrix » Synapse » Version: 0.26.0
    cpe:2.3:a:matrix:synapse:0.26.0
  • Matrix » Synapse » Version: 0.26.1
    cpe:2.3:a:matrix:synapse:0.26.1
  • Matrix » Synapse » Version: 0.27.0
    cpe:2.3:a:matrix:synapse:0.27.0
  • Matrix » Synapse » Version: 0.27.1
    cpe:2.3:a:matrix:synapse:0.27.1
  • Matrix » Synapse » Version: 0.27.2
    cpe:2.3:a:matrix:synapse:0.27.2
  • Matrix » Synapse » Version: 0.27.3
    cpe:2.3:a:matrix:synapse:0.27.3
  • Matrix » Synapse » Version: 0.27.4
    cpe:2.3:a:matrix:synapse:0.27.4
  • Matrix » Synapse » Version: 0.28.0
    cpe:2.3:a:matrix:synapse:0.28.0
  • Matrix » Synapse » Version: 0.28.1
    cpe:2.3:a:matrix:synapse:0.28.1
  • Matrix » Synapse » Version: 0.29.0
    cpe:2.3:a:matrix:synapse:0.29.0
  • Matrix » Synapse » Version: 0.29.1
    cpe:2.3:a:matrix:synapse:0.29.1
  • Matrix » Synapse » Version: 0.30.0
    cpe:2.3:a:matrix:synapse:0.30.0
  • Matrix » Synapse » Version: 0.31.0
    cpe:2.3:a:matrix:synapse:0.31.0
  • Matrix » Synapse » Version: 0.31.1
    cpe:2.3:a:matrix:synapse:0.31.1
  • Matrix » Synapse » Version: 0.31.2
    cpe:2.3:a:matrix:synapse:0.31.2
  • Matrix » Synapse » Version: 0.32.0
    cpe:2.3:a:matrix:synapse:0.32.0
  • Matrix » Synapse » Version: 0.32.1
    cpe:2.3:a:matrix:synapse:0.32.1
  • Matrix » Synapse » Version: 0.32.2
    cpe:2.3:a:matrix:synapse:0.32.2
  • Matrix » Synapse » Version: 0.33.0
    cpe:2.3:a:matrix:synapse:0.33.0
  • Matrix » Synapse » Version: 0.33.1
    cpe:2.3:a:matrix:synapse:0.33.1
  • Matrix » Synapse » Version: 0.33.2
    cpe:2.3:a:matrix:synapse:0.33.2
  • Matrix » Synapse » Version: 0.33.2.1
    cpe:2.3:a:matrix:synapse:0.33.2.1
  • Matrix » Synapse » Version: 0.33.3
    cpe:2.3:a:matrix:synapse:0.33.3
  • Matrix » Synapse » Version: 0.33.3.1
    cpe:2.3:a:matrix:synapse:0.33.3.1
  • Matrix » Synapse » Version: 0.33.4
    cpe:2.3:a:matrix:synapse:0.33.4
  • Matrix » Synapse » Version: 0.33.5
    cpe:2.3:a:matrix:synapse:0.33.5
  • Matrix » Synapse » Version: 0.33.5.1
    cpe:2.3:a:matrix:synapse:0.33.5.1
  • Matrix » Synapse » Version: 0.33.6
    cpe:2.3:a:matrix:synapse:0.33.6
  • Matrix » Synapse » Version: 0.33.7
    cpe:2.3:a:matrix:synapse:0.33.7
  • Matrix » Synapse » Version: 0.33.8
    cpe:2.3:a:matrix:synapse:0.33.8
  • Matrix » Synapse » Version: 0.33.9
    cpe:2.3:a:matrix:synapse:0.33.9
  • Matrix » Synapse » Version: 0.34.0
    cpe:2.3:a:matrix:synapse:0.34.0
  • Matrix » Synapse » Version: 0.34.0.1
    cpe:2.3:a:matrix:synapse:0.34.0.1
  • Matrix » Synapse » Version: 0.34.1
    cpe:2.3:a:matrix:synapse:0.34.1
  • Matrix » Synapse » Version: 0.34.1.1
    cpe:2.3:a:matrix:synapse:0.34.1.1
  • Matrix » Synapse » Version: 0.88.5.1
    cpe:2.3:a:matrix:synapse:0.88.5.1
  • Matrix » Synapse » Version: 0.99.0
    cpe:2.3:a:matrix:synapse:0.99.0
  • Matrix » Synapse » Version: 0.99.1
    cpe:2.3:a:matrix:synapse:0.99.1
  • Matrix » Synapse » Version: 0.99.1.1
    cpe:2.3:a:matrix:synapse:0.99.1.1
  • Matrix » Synapse » Version: 0.99.2
    cpe:2.3:a:matrix:synapse:0.99.2
  • Matrix » Synapse » Version: 0.99.3
    cpe:2.3:a:matrix:synapse:0.99.3
  • Matrix » Synapse » Version: 0.99.3.1
    cpe:2.3:a:matrix:synapse:0.99.3.1
  • Matrix » Synapse » Version: 0.99.3.2
    cpe:2.3:a:matrix:synapse:0.99.3.2
  • Matrix » Synapse » Version: 0.99.4
    cpe:2.3:a:matrix:synapse:0.99.4
  • Matrix » Synapse » Version: 0.99.5
    cpe:2.3:a:matrix:synapse:0.99.5
  • Matrix » Synapse » Version: 0.99.5.2
    cpe:2.3:a:matrix:synapse:0.99.5.2
  • Matrix » Synapse » Version: 1.0.0
    cpe:2.3:a:matrix:synapse:1.0.0
  • Matrix » Synapse » Version: 1.1.0
    cpe:2.3:a:matrix:synapse:1.1.0
  • Matrix » Synapse » Version: 1.10.0
    cpe:2.3:a:matrix:synapse:1.10.0
  • Matrix » Synapse » Version: 1.10.1
    cpe:2.3:a:matrix:synapse:1.10.1
  • Matrix » Synapse » Version: 1.11.0
    cpe:2.3:a:matrix:synapse:1.11.0
  • Matrix » Synapse » Version: 1.11.1
    cpe:2.3:a:matrix:synapse:1.11.1
  • Matrix » Synapse » Version: 1.12.0
    cpe:2.3:a:matrix:synapse:1.12.0
  • Matrix » Synapse » Version: 1.12.1
    cpe:2.3:a:matrix:synapse:1.12.1
  • Matrix » Synapse » Version: 1.12.2
    cpe:2.3:a:matrix:synapse:1.12.2
  • Matrix » Synapse » Version: 1.12.3
    cpe:2.3:a:matrix:synapse:1.12.3
  • Matrix » Synapse » Version: 1.12.4
    cpe:2.3:a:matrix:synapse:1.12.4
  • Matrix » Synapse » Version: 1.13.0
    cpe:2.3:a:matrix:synapse:1.13.0
  • Matrix » Synapse » Version: 1.14.0
    cpe:2.3:a:matrix:synapse:1.14.0
  • Matrix » Synapse » Version: 1.15.0
    cpe:2.3:a:matrix:synapse:1.15.0
  • Matrix » Synapse » Version: 1.15.1
    cpe:2.3:a:matrix:synapse:1.15.1
  • Matrix » Synapse » Version: 1.15.2
    cpe:2.3:a:matrix:synapse:1.15.2
  • Matrix » Synapse » Version: 1.16.0
    cpe:2.3:a:matrix:synapse:1.16.0
  • Matrix » Synapse » Version: 1.16.1
    cpe:2.3:a:matrix:synapse:1.16.1
  • Matrix » Synapse » Version: 1.17.0
    cpe:2.3:a:matrix:synapse:1.17.0
  • Matrix » Synapse » Version: 1.18.0
    cpe:2.3:a:matrix:synapse:1.18.0
  • Matrix » Synapse » Version: 1.19.0
    cpe:2.3:a:matrix:synapse:1.19.0
  • Matrix » Synapse » Version: 1.19.1
    cpe:2.3:a:matrix:synapse:1.19.1
  • Matrix » Synapse » Version: 1.19.2
    cpe:2.3:a:matrix:synapse:1.19.2
  • Matrix » Synapse » Version: 1.19.3
    cpe:2.3:a:matrix:synapse:1.19.3
  • Matrix » Synapse » Version: 1.2.0
    cpe:2.3:a:matrix:synapse:1.2.0
  • Matrix » Synapse » Version: 1.2.1
    cpe:2.3:a:matrix:synapse:1.2.1
  • Matrix » Synapse » Version: 1.20.0
    cpe:2.3:a:matrix:synapse:1.20.0
  • Matrix » Synapse » Version: 1.21.0
    cpe:2.3:a:matrix:synapse:1.21.0
  • Matrix » Synapse » Version: 1.21.1
    cpe:2.3:a:matrix:synapse:1.21.1
  • Matrix » Synapse » Version: 1.21.2
    cpe:2.3:a:matrix:synapse:1.21.2
  • Matrix » Synapse » Version: 1.22.0
    cpe:2.3:a:matrix:synapse:1.22.0
  • Matrix » Synapse » Version: 1.22.1
    cpe:2.3:a:matrix:synapse:1.22.1
  • Matrix » Synapse » Version: 1.23.0
    cpe:2.3:a:matrix:synapse:1.23.0
  • Matrix » Synapse » Version: 1.23.1
    cpe:2.3:a:matrix:synapse:1.23.1
  • Matrix » Synapse » Version: 1.24.0
    cpe:2.3:a:matrix:synapse:1.24.0
  • Matrix » Synapse » Version: 1.25.0
    cpe:2.3:a:matrix:synapse:1.25.0
  • Matrix » Synapse » Version: 1.26.0
    cpe:2.3:a:matrix:synapse:1.26.0
  • Matrix » Synapse » Version: 1.27.0
    cpe:2.3:a:matrix:synapse:1.27.0
  • Matrix » Synapse » Version: 1.3.0
    cpe:2.3:a:matrix:synapse:1.3.0
  • Matrix » Synapse » Version: 1.3.1
    cpe:2.3:a:matrix:synapse:1.3.1
  • Matrix » Synapse » Version: 1.4.0
    cpe:2.3:a:matrix:synapse:1.4.0
  • Matrix » Synapse » Version: 1.4.1
    cpe:2.3:a:matrix:synapse:1.4.1
  • Matrix » Synapse » Version: 1.5.0
    cpe:2.3:a:matrix:synapse:1.5.0
  • Matrix » Synapse » Version: 1.5.1
    cpe:2.3:a:matrix:synapse:1.5.1
  • Matrix » Synapse » Version: 1.6.0
    cpe:2.3:a:matrix:synapse:1.6.0
  • Matrix » Synapse » Version: 1.6.1
    cpe:2.3:a:matrix:synapse:1.6.1
  • Matrix » Synapse » Version: 1.7.0
    cpe:2.3:a:matrix:synapse:1.7.0
  • Matrix » Synapse » Version: 1.7.1
    cpe:2.3:a:matrix:synapse:1.7.1
  • Matrix » Synapse » Version: 1.7.2
    cpe:2.3:a:matrix:synapse:1.7.2
  • Matrix » Synapse » Version: 1.7.3
    cpe:2.3:a:matrix:synapse:1.7.3
  • Matrix » Synapse » Version: 1.8.0
    cpe:2.3:a:matrix:synapse:1.8.0
  • Matrix » Synapse » Version: 1.9.0
    cpe:2.3:a:matrix:synapse:1.9.0
  • Matrix » Synapse » Version: 1.9.1
    cpe:2.3:a:matrix:synapse:1.9.1
  • Fedoraproject » Fedora » Version: 34
    cpe:2.3:o:fedoraproject:fedora:34


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