{"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-2021-23993","title":"Title"},{"category":"description","text":"An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird < 78.9.1.","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-2021-23993","url":"https://www.suse.com/security/cve/CVE-2021-23993"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1184536 for CVE-2021-23993","url":"https://bugzilla.suse.com/1184536"},{"category":"external","summary":"Advisory link for openSUSE-SU-2021:0580-1","url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/46S264KIM7ZLJMHW66XPM4XKEAJEZUEJ/"}],"title":"SUSE CVE CVE-2021-23993","tracking":{"current_release_date":"2025-10-07T02:36:21Z","generator":{"date":"2023-02-15T03:45:18Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2021-23993","initial_release_date":"2023-02-15T03:45:18Z","revision_history":[{"date":"2023-02-15T03:45:18Z","number":"2","summary":"Current version"},{"date":"2025-01-01T04:42:30Z","number":"3","summary":"Current version"},{"date":"2025-01-10T02:49:22Z","number":"4","summary":"Current version"},{"date":"2025-02-15T05:16:45Z","number":"5","summary":"Current version"},{"date":"2025-02-17T05:42:15Z","number":"6","summary":"Current version"},{"date":"2025-03-13T15:45:17Z","number":"7","summary":"Current version"},{"date":"2025-03-15T09:07:35Z","number":"8","summary":"Current version"},{"date":"2025-04-25T04:50:42Z","number":"9","summary":"Current version"},{"date":"2025-10-07T02:36:21Z","number":"10","summary":"Current 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If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. 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