Description
The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.
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 | 1:2.3.16+dfsg1-1 | — |
| Debian 13 | dovecot | 1:2.3.16+dfsg1-1 | — |
| Debian 12 | dovecot | 1:2.3.16+dfsg1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | dovecot | No fix yet | — |
| Ubuntu 18.04 LTS | dovecot | No fix yet | — |
| Ubuntu 16.04 LTS | dovecot | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | dovecot | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | dovecot23 | 2.3.15-58.3 | SUSE-SU-2021:2892-1 |
| SLES 15 SP2 | dovecot23 | 2.3.15-58.3 | SUSE-SU-2021:2892-1 |
| SLES 15 SP1 | dovecot23 | 2.3.15-27.3 | SUSE-SU-2021:2891-1 |
| SLES 15 | dovecot23 | 2.3.15-4.38.3 | SUSE-SU-2021:2890-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | dovecot23 | 2.3.15-27.3 | SUSE-SU-2021:2891-1 |
| SLES for SAP 15 | dovecot23 | 2.3.15-4.38.3 | SUSE-SU-2021:2890-1 |
| SLE HPC 15 SP1 | dovecot23 | 2.3.15-27.3 | SUSE-SU-2021:2891-1 |
| SLE HPC 15 | dovecot23 | 2.3.15-4.38.3 | SUSE-SU-2021:2890-1 |
| SUSE Manager Server 4.0 | dovecot23 | 2.3.15-27.3 | SUSE-SU-2021:2891-1 |
| SUSE Manager Retail Branch Server 4.0 | dovecot23 | 2.3.15-27.3 | SUSE-SU-2021:2891-1 |
| SUSE Manager Proxy 4.0 | dovecot23 | 2.3.15-27.3 | SUSE-SU-2021:2891-1 |
| SUSE Enterprise Storage 6 | dovecot23 | 2.3.15-27.3 | SUSE-SU-2021:2891-1 |
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 | 2.3.15-58.3 | openSUSE-SU-2021:2892-1 |
| openSUSE Leap 15.2 | dovecot23 | 2.3.15-lp152.2.12.1 | openSUSE-SU-2021:1225-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | dovecot | 2.3.20-1 | — |
Advisories 8
- openSUSE-SU-2025:14715-1 dovecot24-2.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2890-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2891-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1225-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2892-1 Security update for dovecot23 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2892-1 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-2022-1536 Dovecot: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 2, 2025
References
- https://dovecot.org/security
- https://www.openwall.com/lists/oss-security/2021/06/28/3
- FEDORA-2021-208340a217 vendor-advisory
- FEDORA-2021-891c1ab1ac vendor-advisory