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CVE-2016-8652

38
FAUCET Score

CVE-2016-8652 describes a denial-of-service vulnerability in Dovecot versions prior to 2.2.27, specifically within its authentication component when auth-policy is enabled. A remote attacker can trigger a crash by aborting authentication without providing a username. This medium-severity vulnerability has a CVSS score of 5.9, indicating a high impact on availability with low attack complexity, but there is no evidence of active exploitation, public exploit code, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.2.27CPE matchmatch criteria
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
48.20%
Probability of exploitation in next 30 days
EPSS Percentile
98.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.4820 is in the 99th percentile among its peer group of 19,954 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-8652Moderate

dovecot: Remote crash when auth-policy component is activated

Nov 29, 2016

References

dovecot.org / pipermail/dovecot-news/2016-December/000333.html
Release NotesVendor Advisory
openwall.com / lists/oss-security/2016/12/02/4
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/12/05/12
Mailing ListThird Party Advisory
securityfocus.com / bid/94639
Third Party AdvisoryVDB Entry