Name: CVE-2025-30355: Improper Input Validation
Creator: Rapid7
Published: 2025-03-27T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2025-30355, CVSS 7.1, EPSS 0.0754

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.

CVSS Details

CVSS 3.1 Base Score: 7.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade synapse	Aug 8, 2025	Mar 27, 2025
Freebsd	—	Upgrade py311-matrix-synapseUpgrade py310-matrix-synapseUpgrade py38-matrix-synapseUpgrade py39-matrix-synapse	Apr 15, 2025	Mar 26, 2025

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CVSS Details

Covered by Rapid7

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