VULNERABILITY INTELLIGENCE
CVE-2023-45129
CVSS score4.9 MEDIUM
EPSS probability1.39%
CISA KEVNot currently listed
Published2023-10-10
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Description
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.
Weakness classification
- security-advisories@github.com: CWE-770
- nvd@nist.gov: CWE-770
Primary references
- security-advisories@github.com — Patch, Vendor Advisory
- security-advisories@github.com — Vendor Advisory
- security-advisories@github.com — Mailing List
- security-advisories@github.com
- security-advisories@github.com — Mailing List
- security-advisories@github.com — Release Notes
- security-advisories@github.com
- af854a3a-2127-422b-91ae-364da2661108 — Patch, Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List