RHSA-2021:3492 — Security Advisory
Red Hat Security Advisory: cyrus-imapd security update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · September 13, 2021
Updated · November 22, 2025
Topic
An update for cyrus-imapd is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
The Cyrus IMAP server provides access to personal mail, system-wide bulletin boards, news-feeds, calendar and contacts through the IMAP, JMAP, NNTP, CalDAV and CardDAV protocols.
Security Fix(es):
- cyrus-imapd: Denial of service via string hashing algorithm collisions (CVE-2021-33582)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.