Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available.
History

Thu, 27 Mar 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 27 Mar 2025 01:15:00 +0000

Type Values Removed Values Added
Description Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available.
Title Synapse vulnerable to federation denial of service via malformed events
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-03-27T00:59:27.996Z

Updated: 2025-03-27T13:47:50.179Z

Reserved: 2025-03-21T14:12:06.270Z

Link: CVE-2025-30355

cve-icon Vulnrichment

Updated: 2025-03-27T13:47:46.383Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-03-27T01:15:12.500

Modified: 2025-03-27T16:45:27.850

Link: CVE-2025-30355

cve-icon Redhat

No data.