CVE-2016-8652 json
The auth component in Dovecot before 2.2.27, when auth-policy is configured, allows a remote attackers to cause a denial of service (crash)…
published 2017-02-16 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-9491
- cvss
- 5.9
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 48.2%
- EPSS 48.2% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
The auth component in Dovecot before 2.2.27, when auth-policy is configured, allows a remote attackers to cause a denial of service (crash) by aborting authentication without setting a username.
Patch / fix
- dovecot Debian 14, Debian 13, Debian 12 1:2.2.27-1
debian advisories DEBIAN-CVE-2016-8652
- dovecot Arch Linux 2.2.27-1
arch linux advisories AVG-94
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2016-8652 updated cvss 7.4
dovecot: Remote crash when auth-policy component is activated
-
Red Hat Enterprise Linux 5 dovecot Red Hat Enterprise Linux 6 dovecot, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole Red Hat Enterprise Linux 7 dovecot, dovecot-mysql, dovecot-pgsql, dovecot-pigeonholenot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
48.20% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
dovecot.org
/pipermail/dovecot-news/2016-December/000333.html
mailing-list, release-notes, vendor-advisory
-
securityfocus.com
/bid/94639
vdb-entry, third-party-advisory
-
openwall.com
/lists/oss-security/2016/12/02/4
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2016/12/05/12
mailing-list, third-party-advisory
Sources
- CVE List CVE-2016-8652
- NVD CVE-2016-8652
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.