4.9
CVSSv3

CVE-2023-45129

Published: 10/10/2023 Updated: 07/01/2024
CVSS v3 Base Score: 4.9 | Impact Score: 3.6 | Exploitability Score: 1.2
VMScore: 0

Vulnerability Summary

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.

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