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7.1
CVSS
High

CVE-2025-30355

PUBLISHED

Synapse vulnerable to federation denial of service via malformed events

Exploited in the wild Remote Low complexity No user interaction
Vendor
element-hq
Product
synapse
Published
Mar 27, 2025
EPSS
—

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.

CVSS scores

CVSS v3.1 7.1 High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Exploitation status

Exploited in the wild

Recorded 2025-03-27 00:59:27 UTC · Source

SSVC decision points

Exploitation
none
Automatable
No
Technical impact
partial

References

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
CVE Mar 27, 2025

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel