CVE-2021-33582

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Cyrus Imap

PublishedSep 1, 2021

First seenSep 1, 2021

How to fix

Update

cyrus imap3.0.16, 3.2.8, 3.4.2 or later

Vendor advisories

lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WJZB45QBUN7CZFGOWCZYUYACNBTX7LVS/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HEO3RURJW6NLIXS7NK5PVU6MGHC4SCM/

Affected products

Product	Affected versions	Fixed in
cyrus imap	v < 3.0.16, 3.2.0 ≤ v < 3.2.8, 3.4.0 ≤ v < 3.4.2	3.0.16, 3.2.8, 3.4.2
fedoraproject fedora	34, 35	—
debian debian_linux	9.0	—

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