CVE-2021-33582

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.

• CWE-407

• https://cyrus.topicbox.com/groups/announce/T3dde0a2352462975-M1386fc44adf967e072f8df13/cyrus-imap-3-4-2-3-2-8-and-3-0-16-releasedPatch, Vendor Advisory
• https://github.com/cyrusimap/cyrus-imapd/commits/masterPatch, Third Party Advisory
• https://github.com/cyrusimap/cyrus-imapd/security/advisoriesNot Applicable, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/06/msg00013.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HEO3RURJW6NLIXS7NK5PVU6MGHC4SCM/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WJZB45QBUN7CZFGOWCZYUYACNBTX7LVS/
• https://www.cyrusimap.org/imap/download/release-notes/index.htmlPatch, Release Notes, Vendor Advisory
• https://cyrus.topicbox.com/groups/announce/T3dde0a2352462975-M1386fc44adf967e072f8df13/cyrus-imap-3-4-2-3-2-8-and-3-0-16-releasedPatch, Vendor Advisory
• https://github.com/cyrusimap/cyrus-imapd/commits/masterPatch, Third Party Advisory
• https://github.com/cyrusimap/cyrus-imapd/security/advisoriesNot Applicable, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/06/msg00013.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HEO3RURJW6NLIXS7NK5PVU6MGHC4SCM/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WJZB45QBUN7CZFGOWCZYUYACNBTX7LVS/
• https://www.cyrusimap.org/imap/download/release-notes/index.htmlPatch, Release Notes, Vendor Advisory

Published

Sep 1, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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