DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs990566, 991323

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
dovecot (PTS)stretch1:2.2.27-3+deb9u5vulnerable
stretch (security)1:2.2.27-3+deb9u7vulnerable
buster (security)1:
bookworm, sid1:2.3.16+dfsg1-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
dovecotsource(unstable)1:2.3.16+dfsg1-1990566, 991323


[buster] - dovecot <postponed> (Minor issue, fix along with next update)
[stretch] - dovecot <no-dsa> (Minor issue)

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