VULNERABILITY INTELLIGENCE

CVE-2025-30355

CVSS score7.1 HIGH
EPSS probability1.23%
CISA KEVNot currently listed
Published2025-03-27
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-20
  • nvd@nist.gov: NVD-CWE-noinfo

Primary references