CVE-2021-33582

    Dashboard / Vulnerabilities / CVE-2021-33582

    CVE-2021-33582

    Published: 1 Sept 2021Last Modified: 8 Jul 2026

    Summary:

    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.

    References: 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://github.com/cyrusimap/cyrus-imapd/security/advisories, https://lists.debian.org/debian-lts-announce/2022/06/msg00013.html, https://cyrus.topicbox.com/groups/announce/T3dde0a2352462975-M1386fc44adf967e072f8df13/cyrus-imap-3-4-2-3-2-8-and-3-0-16-released, https://github.com/cyrusimap/cyrus-imapd/commits/master, https://www.cyrusimap.org/imap/download/release-notes/index.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -12613ed72ab13e0b74ad59fe25bbbbe87bd08c68

    Affected versions

    cyrus-imapd-3.2.7
    cyrus-imapd-3.2.6
    cyrus-imapd-3.2.5
    cyrus-imapd-3.2.4
    cyrus-imapd-3.2.3
    cyrus-imapd-3.2.2
    cyrus-imapd-3.2.1
    cyrus-imapd-3.2.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-33582 | CVE-DB