🛡️ CVE-2025-30355
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-20 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CWE CWE-20
Public Exploit ✅ No
Source NVD
Published 2025-03-27
Updated 2026-06-02
Modified 2025-10-24

Affected Packages

Software From version Fixed in
matrix-synapse 1.127.1
synapse 1.127.1

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