PT-2020-5172 · Dovecot+6 · Dovecot+6

Published 2020-08-12 · Updated 2025-01-30 · CVE-2020-12100

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Dovecot versions prior to 2.3.11.3

Description The issue is caused by uncontrolled recursion in submission, lmtp, and lda, allowing remote attackers to cause a denial of service via a crafted e-mail message with deeply nested MIME parts.

Recommendations For versions prior to 2.3.11.3, update to version 2.3.11.3 or later to resolve the issue. As a temporary workaround, consider restricting the size of incoming e-mail messages to prevent deeply nested MIME parts from causing uncontrolled recursion.

Exploit

Fix

DoS

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

ALT-PU-2020-3376

ALT-PU-2020-3453

ALT-PU-2021-1205

BDU:2020-05783

CESA-2020_3617

CESA-2020_3713

CVE-2020-12100

DLA-2328-1

DSA-4745-1

DSA-4825-1

MGASA-2020-0330

OPENSUSE-SU-2021:0026-1

OPENSUSE-SU-2021:0072-1

OPENSUSE-SU-2021_0026-1

OPENSUSE-SU-2021_0072-1

OPENSUSE-SU-2024:10726-1

OPENSUSE-SU-2025:14715-1

RHSA-2020:3617

RHSA-2020:3713

RHSA-2020:3735

RHSA-2020:3736

RHSA-2020_3617

RHSA-2020_3713

SUSE-SU-2021:0027-1

SUSE-SU-2021:0028-1

SUSE-SU-2021:0029-1

SUSE-SU-2021_0027-1

SUSE-SU-2021_0028-1

SUSE-SU-2021_0029-1

USN-4456-1

USN-4456-2

Affected Products

Alt Linux

Centos

Dovecot

Linuxmint

Red Hat

Suse

Ubuntu

References · 86

• 🔥 http://openwall.com/lists/oss-security/2020/08/12/1 · Exploit
• https://advisories.mageia.org/MGASA-2020-0330.html · Security Note
• https://security-tracker.debian.org/tracker/CVE-2020-12100 · Vendor Advisory
• https://dovecot.org/security · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4456-1 · Vendor Advisory
• https://debian.org/security/2020/dsa-4745 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4AAX2MJEULPVSRZOBX3PNPFSYP4FM4TT · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2020-3713.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-12100 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-12673 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2020-0330 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-12100 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2021:0072-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2020-3617.html · Vendor Advisory
• https://osv.dev/vulnerability/USN-4456-1 · Vendor Advisory