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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-21274

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 1.25.0, a malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver. This affects any server which accepts federation requests from untrusted servers. Issue is resolved in version 1.25.0. As a workaround the `federation_domain_whitelist` setting can be used to restrict the homeservers communicated with over federation.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 68.1%
CVSS Severity
CVSS v3 Score 4.3
CVSS v2 Score 4.3
References
Products affected by CVE-2021-21274
  • 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: 1.3.0
    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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