CVE-2023-45129CWE-770

matrix-synapse vulnerable to denial of service due to malicious server ACL events

Medium · published October 10, 2023

CVSS v3.1
4.9
EPSS
1%
Percentile
72.2
In the wild
Unconfirmed
What it is

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01394 · 72.2th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2023-10-10T17:17Z
EPSS history
Timeline
  • 10 OCT 17:17Z
    matrix-synapse vulnerable to denial of service due to malicious server ACL events
    cvelistv5