CVE-2022-39374
Synapse Denial of service due to incorrect application of event authorization rules during state resolution
Description
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
How to fix CVE-2022-39374
To remediate CVE-2022-39374, upgrade the affected package to a fixed version below.
- —upgrade to 1.68.0-1 or later
- —upgrade to 1.68.0rc1 or later
- —upgrade to 1.68.0 or later
Is CVE-2022-39374 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 1.68.0-1
- >= 1.62.0, < 1.68.0rc1
- >= 1.62.0, < 1.68.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |