Description
In Dovecot before 2.3.10.1, remote unauthenticated attackers can crash the lmtp or submission process by sending mail with an empty localpart.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dovecot | 1:2.3.10.1+dfsg1-1 | — |
| Debian 13 | dovecot | 1:2.3.10.1+dfsg1-1 | — |
| Debian 12 | dovecot | 1:2.3.10.1+dfsg1-1 | — |
| Debian 10 | dovecot | 1:2.3.4.1-5+deb10u2 | DSA-4690-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | dovecot | 1:2.3.7.2-1ubuntu3.1 | USN-4361-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | dovecot +4 | 1:2.3.8-4.el8 | RHSA-2020:4763 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | dovecot +1 | 1:2.3.8-4.el8 | ALSA-2020:4763 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | dovecot23 | 2.3.10-11.1 | SUSE-SU-2020:1380-1 |
| SLES 15 | dovecot23 | 2.3.10-4.22.1 | SUSE-SU-2020:1379-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | dovecot23 | 2.3.10-4.22.1 | SUSE-SU-2020:1379-1 |
| SLE HPC 15 | dovecot23 | 2.3.10-4.22.1 | SUSE-SU-2020:1379-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dovecot23 | 2.3.16-1.6 | openSUSE-SU-2024:10726-1 |
| openSUSE Tumbleweed | dovecot24 | 2.4.0-1.1 | openSUSE-SU-2025:14715-1 |
| openSUSE Leap 15.1 | dovecot23 | 2.3.10-lp151.2.9.1 | openSUSE-SU-2020:0720-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.23 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.22 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.21 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.20 | dovecot | 2.3.10.1-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.18 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.17 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.16 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.15 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.14 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.13 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.12 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.11 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.10 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.9 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.8 | dovecot | 2.3.10.1-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | dovecot +4 | 1:2.3.8-4.el8 | ELSA-2020-4763 |
Advisories 11
- ALSA-2020:4763 Moderate: dovecot security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2020:4763 Red Hat Security Advisory: dovecot security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4361-1 dovecot vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4690-1 dovecot - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:1379-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0720-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14715-1 dovecot24-2.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1380-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10726-1 dovecot23-2.3.16-1.6 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2025-0236 Dovecot: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 2, 2025
- ELSA-2020-4763 Moderate: dovecot security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020
References
- https://dovecot.org/security
- https://www.openwall.com/lists/oss-security/2020/05/18/1
- [oss-security] 20200518 Multiple vulnerabilities in Dovecot IMAP server mailing-list
- USN-4361-1 vendor-advisory
- 20200519 Multiple vulnerabilities in Dovecot IMAP server mailing-list
- http://packetstormsecurity.com/files/157771/Open-Xchange-Dovecot-2.3.10-Null-Pointer-Dereference-Denial-Of-Service.html
- DSA-4690 vendor-advisory
- FEDORA-2020-1dee17d880 vendor-advisory
- openSUSE-SU-2020:0720 vendor-advisory
- FEDORA-2020-b60344c987 vendor-advisory
- FEDORA-2020-cd8b8f887b vendor-advisory
- FEDORA-2020-b8ebc4201e vendor-advisory
- FEDORA-2020-d737c57172 vendor-advisory