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CVE-2023-45129

nvd nist
Published: Oct 10, 2023Modified: Jun 17, 2026

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4.9
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Exploitability: 1.2 / Impact: 3.6
Source: NVD

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.

Affected (3)

Matrix
1 product
Synapse
Fedoraproject
1 product
Fedora
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Synapse
Before 1.94.0
Configuration B
2 vulnerable
Vulnerable SoftwareAffected Versions
Fedoraproject
Fedora
Version 37
Fedora
Version 38

Related CWEs

CWE-770
Allocation of Resources Without Limits or Throttling
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

References (14)

Source: security-advisories@github.com
PatchVendor Advisory
Source: security-advisories@github.com
Vendor Advisory
Source: security-advisories@github.com
Mailing List
Source: security-advisories@github.com
Source: security-advisories@github.com
Mailing List
Source: security-advisories@github.com
Release Notes
Source: security-advisories@github.com
Source: af854a3a-2127-422b-91ae-364da2661108
PatchVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List
Source: af854a3a-2127-422b-91ae-364da2661108
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes
Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.