Home/CVE/Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input tha
CVE

CVE-2021-33582

Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input tha

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.

HIGH · CVSS 7.5 EPSS 0.0102
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-407Inefficient Algorithmic Complexity
▤

Affected Products & Versions

5
cyrus imap< 3.0.16
cyrus imap>= 3.2.0 and < 3.2.8
cyrus imap>= 3.4.0 and < 3.4.2
fedoraproject fedoraall versions
debian linuxall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Sep 2021 · 06:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

5
usnUSN-7224-1
suse-csafopenSUSE-SU-2024:11901-1
rhsaRHSA-2021:3493Important
rhsaRHSA-2021:3492Important
rhsaRHSA-2021:3546Important
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cyrus.topicbox.com/groups/announce/T3dde0a2352462975-M1386fc44adf967e072f8df13/cyrus-imap-3-4-2-3-2-8-and-3-0-16-releasedPatchVendor Advisory
https://github.com/cyrusimap/cyrus-imapd/commits/masterPatchThird Party Advisory
https://github.com/cyrusimap/cyrus-imapd/security/advisoriesNot ApplicableThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/06/msg00013.htmlMailing ListThird 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/
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