CVE-2021-21392

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.
Configurations

Configuration 1 (hide)

cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

History

07 Nov 2023, 03:30

Type Values Removed Values Added
References
  • {'url': 'https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/', 'name': 'FEDORA-2021-a627cfd31e', 'tags': ['Mailing List', 'Third Party Advisory'], 'refsource': 'FEDORA'}
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/ -

23 Nov 2021, 22:36

Type Values Removed Values Added
CPE cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
References
  • (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/ - Mailing List, Third Party Advisory

26 Apr 2021, 18:40

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown
v2 : 4.9
v3 : 6.3
CPE cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*
References (MISC) https://pypi.org/project/matrix-synapse/ - (MISC) https://pypi.org/project/matrix-synapse/ - Product, Third Party Advisory
References (MISC) https://github.com/matrix-org/synapse/pull/9240 - (MISC) https://github.com/matrix-org/synapse/pull/9240 - Patch, Third Party Advisory
References (CONFIRM) https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78 - (CONFIRM) https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78 - Patch, Third Party Advisory

12 Apr 2021, 22:15

Type Values Removed Values Added
New CVE

Information

Published : 2021-04-12 22:15

Updated : 2023-12-10 13:55


NVD link : CVE-2021-21392

Mitre link : CVE-2021-21392

CVE.ORG link : CVE-2021-21392


JSON object : View

Products Affected

fedoraproject

  • fedora

matrix

  • synapse
CWE
CWE-601

URL Redirection to Untrusted Site ('Open Redirect')