Description
The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.
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 | 1:2.3.13+dfsg1-2 | — |
| Debian 13 | dovecot | 1:2.3.13+dfsg1-2 | — |
| Debian 12 | dovecot | 1:2.3.13+dfsg1-2 | — |
| Debian 10 | dovecot | 1:2.3.4.1-5+deb10u7 | DLA-3122-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | dovecot | 1:2.3.7.2-1ubuntu3.4 | USN-4993-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | dovecot +4 | 1:2.3.16-2.el8 | RHSA-2022:1950 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | dovecot +4 | 1:2.3.16-2.el8 | ALSA-2022:1950 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | dovecot | 1:2.3.16-2.el8 | RLSA-2022:1950 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | dovecot23 | 2.3.11.3-55.1 | SUSE-SU-2021:2123-1 |
| SLES 15 SP2 | dovecot23 | 2.3.11.3-55.1 | SUSE-SU-2021:2123-1 |
| SLES 15 SP1 | dovecot23 | 2.3.11.3-24.1 | SUSE-SU-2021:2124-1 |
| SLES 15 | dovecot23 | 2.3.11.3-4.35.1 | SUSE-SU-2021:2122-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | dovecot23 | 2.3.11.3-24.1 | SUSE-SU-2021:2124-1 |
| SLES for SAP 15 | dovecot23 | 2.3.11.3-4.35.1 | SUSE-SU-2021:2122-1 |
| SLE HPC 15 SP1 | dovecot23 | 2.3.11.3-24.1 | SUSE-SU-2021:2124-1 |
| SLE HPC 15 | dovecot23 | 2.3.11.3-4.35.1 | SUSE-SU-2021:2122-1 |
| SUSE Manager Server 4.0 | dovecot23 | 2.3.11.3-24.1 | SUSE-SU-2021:2124-1 |
| SUSE Manager Retail Branch Server 4.0 | dovecot23 | 2.3.11.3-24.1 | SUSE-SU-2021:2124-1 |
| SUSE Manager Proxy 4.0 | dovecot23 | 2.3.11.3-24.1 | SUSE-SU-2021:2124-1 |
| SUSE Enterprise Storage 6 | dovecot23 | 2.3.11.3-24.1 | SUSE-SU-2021:2124-1 |
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 15.3 | dovecot23 | 2.3.11.3-55.1 | openSUSE-SU-2021:2123-1 |
| openSUSE Leap 15.2 | dovecot23 | 2.3.11.3-lp152.2.9.1 | openSUSE-SU-2021:0920-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dovecot | 2.3.15-r0 | — |
| Alpine v3.23 | dovecot | 2.3.15-r0 | — |
| Alpine v3.22 | dovecot | 2.3.15-r0 | — |
| Alpine v3.21 | dovecot | 2.3.15-r0 | — |
| Alpine v3.20 | dovecot | 2.3.15-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | dovecot | 2.3.15-r0 | — |
| Alpine v3.18 | dovecot | 2.3.15-r0 | — |
| Alpine v3.17 | dovecot | 2.3.15-r0 | — |
| Alpine v3.16 | dovecot | 2.3.15-r0 | — |
| Alpine v3.15 | dovecot | 2.3.15-r0 | — |
| Alpine v3.14 | dovecot | 2.3.15-r0 | — |
| Alpine v3.13 | dovecot | 2.3.15-r0 | — |
| Alpine v3.12 | dovecot | 2.3.15-r0 | — |
| Alpine v3.11 | dovecot | 2.3.15-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | dovecot | 2.3.20-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | dovecot +4 | 1:2.3.16-2.el8 | ELSA-2022-1950 |
Advisories 14
- ALSA-2022:1950 Moderate: dovecot security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2022:1950 Red Hat Security Advisory: dovecot security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4993-1 dovecot vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-3122-1 dovecot - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:1950 Moderate: dovecot security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2021:0920-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2124-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2122-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2123-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2123-1 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
- openSUSE-SU-2024:10726-1 dovecot23-2.3.16-1.6 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2022-1536 Dovecot: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 2, 2025
- ELSA-2022-1950 Moderate: dovecot security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 17, 2022
References
- https://dovecot.org/security
- https://www.openwall.com/lists/oss-security/2021/06/28/2
- FEDORA-2021-208340a217 vendor-advisory
- FEDORA-2021-891c1ab1ac vendor-advisory
- GLSA-202107-41 vendor-advisory
- [debian-lts-announce] 20220927 [SECURITY] [DLA 3122-1] dovecot security update mailing-list