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Fencer Intel
medium 5.3

CVE-2020-10967 json

In Dovecot before 2.3.10.1, remote unauthenticated attackers can crash the lmtp or submission process by sending mail with an empty localpa…

published 6y ago modified 4mo ago also EUVD-2020-3368

cvss
5.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
8.2%
EPSS 8.2% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

In Dovecot before 2.3.10.1, remote unauthenticated attackers can crash the lmtp or submission process by sending mail with an empty localpart.

Patch / fix

  • dovecot dovecot 2.3.10.1
  • dovecot Debian 14, Debian 13, Debian 12 1:2.3.10.1+dfsg1-1

debian advisories DEBIAN-CVE-2020-10967

  • dovecot Ubuntu 20.04 LTS 1:2.3.7.2-1ubuntu3.1

ubuntu advisories UBUNTU-CVE-2020-10967

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dovecot RHEL 8 1:2.3.8-4.el8
  • dovecot-mysql RHEL 8 1:2.3.8-4.el8
  • dovecot-pgsql RHEL 8 1:2.3.8-4.el8
  • dovecot-pigeonhole RHEL 8 1:2.3.8-4.el8

red hat advisories RHSA-2020:4763

  • dovecot23 SLE Module for Server Applications 15 SP1 2.3.10-11.1
  • dovecot23 SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.3.10-4.22.1

suse advisories SUSE-SU-2020:1380-1SUSE-SU-2020:1379-1

  • dovecot24 openSUSE Tumbleweed 2.4.0-1.1
  • dovecot23 openSUSE Tumbleweed 2.3.16-1.6
  • dovecot23 openSUSE Leap 15.1 2.3.10-lp151.2.9.1

opensuse advisories openSUSE-SU-2025:14715-1openSUSE-SU-2024:10726-1openSUSE-SU-2020:0720-1

  • dovecot AlmaLinux 8 1:2.3.8-4.el8

almalinux advisories ALSA-2020:4763

  • dovecot Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 2.3.10.1-r0

alpine advisories ALPINE-CVE-2020-10967

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dovecot Arch Linux 2.3.10.1-1

arch linux advisories AVG-1162

Is CVE-2020-10967 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10967 updated cvss 5.3

dovecot: sending mail with empty quoted localpart leads to DoS

  • Red Hat CodeReady Linux Builder (v. 8) dovecot 2.3.8-4.el8 Red Hat Enterprise Linux AppStream (v. 8) dovecot 2.3.8-4.el8, dovecot-mysql 2.3.8-4.el8, dovecot-pgsql 2.3.8-4.el8, dovecot-pigeonhole 2.3.8-4.el8
    fixed: vendor fix RHSA-2020:4763
  • Red Hat Enterprise Linux 5 dovecot Red Hat Enterprise Linux 6 dovecot, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole Red Hat Enterprise Linux 7 dovecot, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.15% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • seclists.org http://seclists.org/fulldisclosure/2020/May/37 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 5.3 CVSS:3.0/AC:L/AV:N/A:L/C:N/I:N/PR:N/S:U/UI:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.