RHSA-2021:1887MediumCVSS 7.5

Red Hat Security Advisory: dovecot security and bug fix update

Published
May 18, 2021
Last Modified
November 5, 2026

🔗 CVE IDs covered (2)

CVE-2020-24386 →CVE-2020-25275 →

📋 Description

CVE-2020-24386 — dovecot: IMAP hibernation function allows mail access CVE-2020-25275 — dovecot: Denial of service via mail MIME parsing

🎯 Affected products70

  • Red Hat CodeReady Linux Builder (v. 8)
  • Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-1:2.3.8-9.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-1:2.3.8-9.el8.i686 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-1:2.3.8-9.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-1:2.3.8-9.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-1:2.3.8-9.el8.src as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-1:2.3.8-9.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.aarch64 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.i686 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.ppc64le as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.s390x as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.x86_64 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debuginfo-1:2.3.8-9.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.aarch64 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.i686 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.ppc64le as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.s390x as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.x86_64 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-debugsource-1:2.3.8-9.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • dovecot-devel-1:2.3.8-9.el8.aarch64 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-devel-1:2.3.8-9.el8.i686 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-devel-1:2.3.8-9.el8.ppc64le as a component of Red Hat CodeReady Linux Builder (v. 8)
  • dovecot-devel-1:2.3.8-9.el8.s390x as a component of Red Hat CodeReady Linux Builder (v. 8)
  • +40 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: To mitigate this flaw, ensure that imap_hibernate_timeout is set to 0 or not set at all/commented out in both /etc/dovecot/dovecot.conf or /etc/dovecot/conf.d/20-imap.conf. Workaround: A potential mitigation is configuring the mail transfer agent to not accept messages with more than 10,000 MIME parts.

🔗 References (9)