Description
Dovecot 1.2.x before 1.2.15 allows remote authenticated users to cause a denial of service (master process outage) by simultaneously disconnecting many (1) IMAP or (2) POP3 sessions.
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 | 1:1.2.15-1 | — |
| Debian 13 | dovecot | 1:1.2.15-1 | — |
| Debian 12 | dovecot | 1:1.2.15-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | dovecot +4 | 1:2.0.9-2.el6 | RHSA-2011:0600 |
Advisories 1
- RHSA-2011:0600 Red Hat Security Advisory: dovecot security and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- USN-1059-1 vendor-advisory
- MDVSA-2010:217 vendor-advisory
- 43220 third-party-advisory
- ADV-2011-0301 vdb-entry
- [dovecot] 20101002 v1.2.15 released mailing-list
- RHSA-2011:0600 vendor-advisory
- ADV-2010-2840 vdb-entry