cve-2021-29471
Vulnerability from cvelistv5
Published
2021-05-11 15:05
Modified
2024-08-03 22:11
EPSS score ?
0.21% (0.58747)
Summary
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 1.33.2 "Push rules" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.
Impacted products
Vendor Product Version
Show details on NVD website


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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