The auth component in Dovecot before 2.2.27, when auth-policy is configured, allows a…
Priority MEDIUM 57CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
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.
Why it matters now
EPSS 0.48197 98th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* | up to 2.2.27 | Vulnerable | The Dovecot Project |
- cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* Versions up to 2.2.27 Vulnerable ·The Dovecot Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2016-8652
- 2026-10-03 Alias added: GHSA-vm4w-qxvr-6wfp
References
More The Dovecot Project Dovecot vulnerabilities
- TI-2019-08591 In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2)… CVSS 3.0CRITICAL 9.8
- TI-2020-05686 lib-smtp in submission-login and lmtp in Dovecot 2.3.9 before 2.3.9.3 mishandles… CVSS 3.1HIGH 7.5
- TI-2017-10567 Out-of-bounds read in Dovecot CVSS 3.0HIGH 7.1
- TI-2022-12706 An issue was discovered in the auth component in Dovecot 2.2 and 2.3 before 2.3.20. CVSS 3.1HIGH 8.8
- TI-2020-08835 In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP… CVSS 3.1HIGH 7.5
- TI-2020-10078 In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth… CVSS 3.1HIGH 7.5
Sources
- CVE-2016-8652 · CVE Program
- CVE-2016-8652 · NVD
- FIRST EPSS
- GHSA-vm4w-qxvr-6wfp · GitHub Advisory Database · CC BY 4.0
- CVE-2016-8652 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences