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TI-2020-09735 Aliases CVE-2020-12100GHSA-pq8h-22gg-vpmw

In Dovecot before 2.3.11.3, uncontrolled recursion in submission, lmtp, and lda allows…

Priority MEDIUM 41CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 9 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-674.

Summary

In Dovecot before 2.3.11.3, uncontrolled recursion in submission, lmtp, and lda allows remote attackers to cause a denial of service (resource consumption) via a crafted e-mail message with deeply nested MIME parts.

Why it matters now

EPSS 0.05258 92nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 4 advisoriesRed Hat: 9 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 10

CPEVersionsRoleVendor
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*before 2.3.11.3VulnerableThe Dovecot Project
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*31VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*32VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
  • cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* Versions before 2.3.11.3 Vulnerable ·The Dovecot Project
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical

Remediation

Red Hat 4 advisories

  • RHSA-2020:3736 Released 2020-09-14 · Red Hat rating Important
    dovecot security update
    • Red Hat CodeReady Linux Builder EUS (v. 8.1) dovecot-1:2.2.36-10.el8_1.2, dovecot-devel-1:2.2.36-10.el8_1.2
    • Red Hat Enterprise Linux AppStream EUS (v. 8.1) dovecot-1:2.2.36-10.el8_1.2, dovecot-mysql-1:2.2.36-10.el8_1.2, dovecot-pgsql-1:2.2.36-10.el8_1.2 +1
  • RHSA-2020:3735 Released 2020-09-14 · Red Hat rating Important
    dovecot security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.0) dovecot-1:2.2.36-5.el8_0.3, dovecot-mysql-1:2.2.36-5.el8_0.3, dovecot-pgsql-1:2.2.36-5.el8_0.3
  • RHSA-2020:3713 Released 2020-09-10 · Red Hat rating Important
    dovecot security update
    • Red Hat CodeReady Linux Builder (v. 8) dovecot-1:2.3.8-2.el8_2.2, dovecot-devel-1:2.3.8-2.el8_2.2
    • Red Hat Enterprise Linux AppStream (v. 8) dovecot-1:2.3.8-2.el8_2.2, dovecot-mysql-1:2.3.8-2.el8_2.2, dovecot-pgsql-1:2.3.8-2.el8_2.2 +1
Show 1 more Red Hat advisories
  • RHSA-2020:3617 Released 2020-09-03 · Red Hat rating Important
    dovecot security update
    • Red Hat Enterprise Linux Server (v. 7) dovecot-1:2.2.36-6.el7_8.1, dovecot-1:2.2.36-6.el7_8.1.ppc, dovecot-mysql-1:2.2.36-6.el7_8.1 +2
    • Red Hat Enterprise Linux Server Optional (v. 7) dovecot-devel-1:2.2.36-6.el7_8.1
    • Red Hat Enterprise Linux Workstation (v. 7) dovecot-1:2.2.36-6.el7_8.1, dovecot-mysql-1:2.2.36-6.el7_8.1, dovecot-pgsql-1:2.2.36-6.el7_8.1 +1
    • Red Hat Enterprise Linux Workstation Optional (v. 7) dovecot-devel-1:2.2.36-6.el7_8.1

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2020:3713
Red Hat CodeReady Linux Builder EUS (v. 8.1)Fixed RHSA-2020:3736
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:3713
Red Hat Enterprise Linux AppStream E4S (v. 8.0)Fixed RHSA-2020:3735
Red Hat Enterprise Linux AppStream EUS (v. 8.1)Fixed RHSA-2020:3736
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:3617
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:3617
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:3617
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:3617
Not affected: 1 product
  • Red Hat Enterprise Linux 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-12100
  2. 2026-10-03 Alias added: GHSA-pq8h-22gg-vpmw

References

Exploit 1

Advisory 11

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences