Resource exhaustion in Matrix Synapse
CVE-2022-39374
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all further messages and state changes sent in that room from the vulnerable homeserver to be rejected. This issue has been patched in version 1.68.0
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Matrix Synapse
- Matrix-Org Synapse — versions >= 1.62.0, < 1.68.0
Weakness classification (CWE)
References
- github.com/matrix-org/synapse/security/advisories/GHSA-p9qp-c452-f9r7 (Mitigation, Vendor Advisory)
- github.com/matrix-org/synapse/pull/13723 (Patch, Issue Tracking)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/…
Frequently asked questions
- What is CVE-2022-39374?
- CVE-2022-39374 is a medium-severity vulnerability in Matrix Synapse, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2023-05-26.
- How severe is CVE-2022-39374?
- Medium severity. CVSS v3 base score is 6.5 out of 10.