{"id":"USN-4993-1","summary":"dovecot vulnerabilities","details":"Kirin discovered that Dovecot incorrectly escaped kid and azp fields in JWT\ntokens. A local attacker could possibly use this issue to validate tokens\nusing arbitrary keys. This issue only affected Ubuntu 20.10 and Ubuntu\n21.04. (CVE-2021-29157)\n\nFabian Ising and Damian Poddebniak discovered that Dovecot incorrectly\nhandled STARTTLS when using the SMTP submission service. A remote attacker\ncould possibly use this issue to inject plaintext commands before\nSTARTTLS negotiation. (CVE-2021-33515)\n","modified":"2026-02-10T04:42:14Z","published":"2021-06-21T13:50:48Z","related":["UBUNTU-CVE-2021-33515"],"upstream":["CVE-2021-33515","UBUNTU-CVE-2021-29157","UBUNTU-CVE-2021-33515"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4993-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-29157"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33515"}],"affected":[{"package":{"name":"dovecot","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dovecot@1:2.3.7.2-1ubuntu3.4?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.7.2-1ubuntu3.4"}]}],"versions":["1:2.3.4.1-5ubuntu3","1:2.3.7.2-1ubuntu1","1:2.3.7.2-1ubuntu2","1:2.3.7.2-1ubuntu3","1:2.3.7.2-1ubuntu3.1","1:2.3.7.2-1ubuntu3.2","1:2.3.7.2-1ubuntu3.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"dovecot-auth-lua","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-core","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-dev","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-gssapi","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-imapd","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-ldap","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-lmtpd","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-lucene","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-managesieved","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-mysql","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-pgsql","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-pop3d","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-sieve","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-solr","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-sqlite","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"dovecot-submissiond","binary_version":"1:2.3.7.2-1ubuntu3.4"},{"binary_name":"mail-stack-delivery","binary_version":"1:2.3.7.2-1ubuntu3.4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-33515"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4993-1.json"}}],"schema_version":"1.7.3"}