VDB
CVE-2021-21393
CVE-2021-21393
PUBLISHED
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.
EPSS 0.55% · 68.3th percentile
Risk Scores
EPSS Score
0.55%
68.3th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:22.04:LTS | matrix-synapse | 1.47.1-1, 1.48.0-1, 1.49.0-1 |
| Ubuntu:Pro:20.04:LTS | matrix-synapse | 1.6.1-1, 1.10.0-1, 0 |
Exploit Intelligence
Timeline
- Apr 12, 2021 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Dec 27, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
- Sep 4, 2022 EPSS Score
- Nov 6, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-21393 third-party-advisory
- https://github.com/matrix-org/synapse/security/advisories/GHSA-jrh7-mhhx-6h88 third-party-advisory
- https://github.com/matrix-org/synapse/pull/9321 third-party-advisory
- https://github.com/matrix-org/synapse/pull/9393 third-party-advisory
- https://pypi.org/project/matrix-synapse/ third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-21393 third-party-advisory