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.
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2021-04-12T21:50:14
Updated: 2024-08-03T18:09:15.930Z
Reserved: 2020-12-22T00:00:00
Link: CVE-2021-21392
Vulnrichment
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NVD
Status : Modified
Published: 2021-04-12T22:15:13.147
Modified: 2024-11-21T05:48:15.877
Link: CVE-2021-21392
Redhat
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