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.
Rooms with malicious server ACL events can be purged and blocked using the admin API.
{ "nvd_published_at": "2023-10-10T18:15:19Z", "cwe_ids": [ "CWE-770" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2023-10-10T21:27:53Z" }