CVE-2022-39374CWE-400

Synapse Denial of service due to incorrect application of event authorization rules during state resolution

Medium · published May 26, 2023

CVSS v3.0
6.5
EPSS
1%
Percentile
60.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.0
6.5 · MEDIUM
Vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00941 · 60.6th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2023-05-26T13:44Z
EPSS history
Timeline
  • 26 MAY 13:44Z
    Synapse Denial of service due to incorrect application of event authorization rules during state resolution
    cvelistv5