{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"moderate"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2021-21392","title":"Title"},{"category":"description","text":"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.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2021-21392","url":"https://www.suse.com/security/cve/CVE-2021-21392"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1184754 for CVE-2021-21392","url":"https://bugzilla.suse.com/1184754"}],"title":"SUSE CVE CVE-2021-21392","tracking":{"current_release_date":"2025-02-17T05:46:27Z","generator":{"date":"2023-02-15T03:46:16Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2021-21392","initial_release_date":"2023-02-15T03:46:16Z","revision_history":[{"date":"2023-02-15T03:46:16Z","number":"2","summary":"Current version"},{"date":"2025-01-01T04:45:56Z","number":"3","summary":"Current version"},{"date":"2025-02-15T05:20:22Z","number":"4","summary":"Current version"},{"date":"2025-02-17T05:46:27Z","number":"5","summary":"Current version"}],"status":"interim","version":"5"}}}