Resource exhaustion in Matrix Synapse
CVE-2021-29471
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 whic…
Vulnerability class: DoS (Denial of Service)
EPSS: 0.016 (73.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Matrix Synapse
- Matrix-org Synapse — versions < 1.33.2
- Fedoraproject Fedora — versions 34
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-29471?
- CVE-2021-29471 is a low-severity vulnerability in Matrix Synapse, classified under Uncontrolled Resource Consumption. CVSS score: 3.7/10. Published 2021-05-11.
- How severe is CVE-2021-29471?
- Low severity. CVSS v3 base score is 3.7 out of 10.