VDB
CVE-2021-21392
CVE-2021-21392
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 requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks. See referenced GitHub security advisory for details and workarounds.
EPSS 0.20% · 42.1th percentile
Risk Scores
EPSS Score
0.20%
42.1th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:20.04:LTS | matrix-synapse | 0, 1.3.0-1, 1.4.0-1 |
| Ubuntu:Pro:22.04:LTS | matrix-synapse | 1.47.1-1, 1.51.0-1, 1.52.0-1 |
| Ubuntu:Pro:18.04:LTS | matrix-synapse | 0.19.2+dfsg-6, 0.24.0+dfsg-1, 0.24.0+dfsg-1ubuntu0.1~esm4 |
Exploit Intelligence
Timeline
- Apr 12, 2021 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 1, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
- Sep 4, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-21392 third-party-advisory
- https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78 third-party-advisory
- https://github.com/matrix-org/synapse/pull/9240 third-party-advisory
- https://pypi.org/project/matrix-synapse/ third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-21392 third-party-advisory