Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. Refer to referenced GitHub security advisory for additional details including workarounds.
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2021-04-12T21:35:14
Updated: 2024-08-03T18:09:15.986Z
Reserved: 2020-12-22T00:00:00
Link: CVE-2021-21393
Vulnrichment
No data.
NVD
Status : Modified
Published: 2021-04-12T22:15:13.227
Modified: 2024-11-21T05:48:16.003
Link: CVE-2021-21393
Redhat
No data.