CVE-2025-30355

EPSS 5.78%
Published 27.03.2025 00:59:27
Last modified 26.08.2025 19:24:45
Source security-advisories@github.com
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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.

Affected products Warnungen 0 Metrics 3 CWE 1 References 6

Data is provided by the National Vulnerability Database (NVD)

Matrix ≫ Synapse Version < 1.127.1

Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.

EPSS Metriken
Type	Source	Score	Percentile
EPSS	FIRST.org	5.78%	0.901

CVSS Metriken
Source	Base Score	Exploit Score	Impact Score	Vector string
nvd@nist.gov	7.5	3.9	3.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
security-advisories@github.com	7.1	2.8	4.2	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6

Vendor Advisory

https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389

Patch

https://github.com/element-hq/synapse/releases/tag/v1.127.1

Release Notes

https://nvd.nist.gov/vuln/detail/CVE-2025-30355

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2025-30355

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2025-30355

EUVD