CVE-2016-8652
The auth component in Dovecot before 2.2.27, when auth-policy is configured, allows a remote...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2016-8652- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2016-8652- Updated
- 2026-11-02
EUVDEUVD-2016-9491 No score
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.
- Record
EUVD-2016-9491- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vm4w-qxvr-6wfp
The auth component in Dovecot before 2.2.27, when auth-policy is configured, allows a remote...
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.
- Record
GHSA-vm4w-qxvr-6wfp- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2016-8652- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2016-8652
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.
- Record
DEBIAN-CVE-2016-8652- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2016-8652 is a medium vulnerability (CVSS 5.9) in Dovecot, published February 16, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 48.2%, the 98th percentile. Fixed in dovecot 1:2.2.27-1.
References
securityfocus.com/bid/94639
openwall.com/lists/oss-security/2016/12/02/4
dovecot.org/pipermail/dovecot-news/2016-December/000333.html
nvd.nist.gov/vuln/detail/CVE-2016-8652
github.com/advisories/GHSA-vm4w-qxvr-6wfp
security-tracker.debian.org/tracker/CVE-2016-8652