CVE-2025-30355 – Synapse Denial of Federation Vulnerability

The following table lists the changes that have been made to the
CVE-2025-30355 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Mar. 27, 2025

    Action Type Old Value New Value
    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.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
    Added CWE CWE-20
    Added Reference https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389
    Added Reference https://github.com/element-hq/synapse/releases/tag/v1.127.1
    Added Reference https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6
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