Description
It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1 incorrectly handled client certificates. A remote attacker in possession of a valid certificate with an empty username field could possibly use this issue to impersonate other users.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| dovecot | dovecot | 2.2.36.1, 2.3.4.1 | — |
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 | 1:2.3.4.1-1 | — |
| Debian 13 | dovecot | 1:2.3.4.1-1 | — |
| Debian 12 | dovecot | 1:2.3.4.1-1 | — |
| Debian 9 | dovecot | 1:2.2.27-3+deb9u3 | DSA-4385-1 |
| Debian 8 | dovecot | 1:2.2.13-12~deb8u5 | DLA-1667-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | dovecot | 1:2.2.33.2-1ubuntu4.2 | USN-3881-1 |
| Ubuntu 16.04 LTS | dovecot | 1:2.2.22-1ubuntu2.9 | USN-3881-1 |
| Ubuntu 14.04 LTS | dovecot | 1:2.2.9-1ubuntu2.5 | USN-3881-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | dovecot +4 | 1:2.2.36-10.el8 | RHSA-2019:3467 |
| RHEL 7 | dovecot +4 | 1:2.2.36-6.el7 | RHSA-2020:1062 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | dovecot23 | 2.3.3-4.7.4 | SUSE-SU-2019:0414-1 |
| SLES 12 SP4 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SLES 12 SP3 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SLES 12 SP2 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SLES 12 SP1 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SLES for SAP 12 SP4 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SLES for SAP 12 SP3 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SLES for SAP 12 SP2 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SLES for SAP 12 SP1 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SUSE OpenStack Cloud 7 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
| SUSE Enterprise Storage 4 | dovecot22 | 2.2.31-19.14.2 | SUSE-SU-2019:0900-1 |
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 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.23 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.22 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.21 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.20 | dovecot | 2.3.4.1-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.18 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.17 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.16 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.15 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.14 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.13 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.12 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.11 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.10 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.9 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.8 | dovecot | 2.3.4.1-r0 | — |
| Alpine v3.7 | dovecot | 2.2.36.1-r0 | — |
| Alpine v3.6 | dovecot | 2.2.36.1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | dovecot +4 | 1:2.2.36-6.amzn2 | ALAS2-2020-1473 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | dovecot +4 | 1:2.2.36-10.el8 | ELSA-2019-3467 |
| Oracle Linux 7 | dovecot +4 | 1:2.2.36-6.el7 | ELSA-2020-1062 |
Advisories 13
- RHSA-2019:3467 Red Hat Security Advisory: dovecot security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:1062 Red Hat Security Advisory: dovecot security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3881-1 dovecot vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4385-1 dovecot - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1667-1 dovecot - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:0900-1 Security update for dovecot22 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0414-1 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-2025-0243 Dovecot: Schwachstelle ermöglicht Erlangen von Benutzerrechten BSI CERT-Bund (WID) · Feb 2, 2025
- ALAS2-2020-1473 Moderate: dovecot security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 25, 2020
- ELSA-2020-1062 Moderate: dovecot security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 6, 2020
- ELSA-2019-3467 Moderate: dovecot security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
References
- https://www.dovecot.org/list/dovecot/2019-February/114575.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3814
- openSUSE-SU-2019:1220 vendor-advisory
- GLSA-201904-19 vendor-advisory
- FEDORA-2019-9e004decea vendor-advisory
- FEDORA-2019-1b61a528dd vendor-advisory
- RHSA-2019:3467 vendor-advisory