CVE-2025-30355
March 27, 2025
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 Packages
https://github.com/element-hq/synapse.git (GITHUB):
Affected version(s) Fix Suggestion:
Update to version v1.127.1matrix-synapse (PYTHON):
Affected version(s) >=0.33.5 <1.127.1Fix Suggestion:
Update to version 1.127.1matrix-synapse (PYTHON):
Affected version(s) >=0.33.5 <1.127.1Fix Suggestion:
Update to version 1.127.1Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Improper Input Validation
EPSS
Base Score:
7.54
