{"id":"UBUNTU-CVE-2021-33582","details":"Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input that is mishandled during hash-table interaction. Because there are many insertions into a single bucket, strcmp becomes slow. This is fixed in 3.4.2, 3.2.8, and 3.0.16.","modified":"2026-04-22T14:47:04.952821Z","published":"2021-09-01T00:00:00Z","related":["USN-7224-1"],"upstream":["CVE-2021-33582"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33582"},{"type":"REPORT","url":"https://github.com/cyrusimap/cyrus-imapd/commit/93901789300aeefbe5c5829f2ab938e567a796dd"},{"type":"REPORT","url":"https://github.com/cyrusimap/cyrus-imapd/commit/768b3aa4f51b636f0c591b6b34dd96aab9ce0136"},{"type":"REPORT","url":"https://github.com/cyrusimap/cyrus-imapd/commit/3411deb448d29f4d287e90272dfa70d6f067ca67"},{"type":"REPORT","url":"https://github.com/cyrusimap/cyrus-imapd/commit/810bb164a805395cd7a42412644f1d595e6b105e"},{"type":"REPORT","url":"https://github.com/cyrusimap/cyrus-imapd/commit/943d4c37a063d2cf3384a88df9b884a167c04468"},{"type":"REPORT","url":"https://www.cyrusimap.org/imap/download/release-notes/3.2/x/3.2.8.html"},{"type":"REPORT","url":"https://www.cyrusimap.org/imap/download/release-notes/3.4/x/3.4.2.html"},{"type":"REPORT","url":"https://www.cyrusimap.org/imap/download/release-notes/3.2/x/3.2.8.html"},{"type":"REPORT","url":"https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.16.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-33582"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7224-1"}],"affected":[{"package":{"name":"cyrus-imapd-2.4","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/cyrus-imapd-2.4@2.4.18-3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.17+caldav~beta10-18","2.4.17+nocaldav-2","2.4.18-3"],"ecosystem_specific":{"binaries":[{"binary_name":"cyrus-admin","binary_version":"2.4.18-3"},{"binary_name":"cyrus-admin-2.4","binary_version":"2.4.18-3"},{"binary_name":"cyrus-clients","binary_version":"2.4.18-3"},{"binary_name":"cyrus-clients-2.4","binary_version":"2.4.18-3"},{"binary_name":"cyrus-common","binary_version":"2.4.18-3"},{"binary_name":"cyrus-common-2.4","binary_version":"2.4.18-3"},{"binary_version":"2.4.18-3","binary_name":"cyrus-dev-2.4"},{"binary_name":"cyrus-doc-2.4","binary_version":"2.4.18-3"},{"binary_version":"2.4.18-3","binary_name":"cyrus-imapd"},{"binary_name":"cyrus-imapd-2.4","binary_version":"2.4.18-3"},{"binary_name":"cyrus-murder","binary_version":"2.4.18-3"},{"binary_name":"cyrus-murder-2.4","binary_version":"2.4.18-3"},{"binary_version":"2.4.18-3","binary_name":"cyrus-nntpd"},{"binary_name":"cyrus-nntpd-2.4","binary_version":"2.4.18-3"},{"binary_name":"cyrus-pop3d","binary_version":"2.4.18-3"},{"binary_name":"cyrus-pop3d-2.4","binary_version":"2.4.18-3"},{"binary_name":"cyrus-replication","binary_version":"2.4.18-3"},{"binary_name":"cyrus-replication-2.4","binary_version":"2.4.18-3"},{"binary_name":"libcyrus-imap-perl","binary_version":"2.4.18-3"},{"binary_name":"libcyrus-imap-perl24","binary_version":"2.4.18-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33582.json"}},{"package":{"name":"cyrus-imapd","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/cyrus-imapd@2.5.10-3ubuntu1.1+esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.10-3ubuntu1.1+esm1"}]}],"versions":["2.5.10-3build1","2.5.10-3build2","2.5.10-3ubuntu1","2.5.10-3ubuntu1.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"cyrus-admin","binary_version":"2.5.10-3ubuntu1.1+esm1"},{"binary_version":"2.5.10-3ubuntu1.1+esm1","binary_name":"cyrus-caldav"},{"binary_name":"cyrus-clients","binary_version":"2.5.10-3ubuntu1.1+esm1"},{"binary_name":"cyrus-common","binary_version":"2.5.10-3ubuntu1.1+esm1"},{"binary_name":"cyrus-imapd","binary_version":"2.5.10-3ubuntu1.1+esm1"},{"binary_name":"cyrus-murder","binary_version":"2.5.10-3ubuntu1.1+esm1"},{"binary_version":"2.5.10-3ubuntu1.1+esm1","binary_name":"cyrus-nntpd"},{"binary_version":"2.5.10-3ubuntu1.1+esm1","binary_name":"cyrus-pop3d"},{"binary_name":"cyrus-replication","binary_version":"2.5.10-3ubuntu1.1+esm1"},{"binary_version":"2.5.10-3ubuntu1.1+esm1","binary_name":"libcyrus-imap-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33582.json"}},{"package":{"name":"cyrus-imapd","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/cyrus-imapd@3.0.13-5ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.13-5ubuntu0.1~esm1"}]}],"versions":["3.0.11-1","3.0.11-1build1","3.0.12-1","3.0.12-2","3.0.12-2ubuntu2","3.0.12-2ubuntu3","3.0.13-2ubuntu1","3.0.13-3ubuntu1","3.0.13-4ubuntu1","3.0.13-5"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"cyrus-admin","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-caldav","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-clients","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-common","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-imapd","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-murder","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-nntpd","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-pop3d","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"cyrus-replication","binary_version":"3.0.13-5ubuntu0.1~esm1"},{"binary_name":"libcyrus-imap-perl","binary_version":"3.0.13-5ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33582.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}