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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 48.2%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
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.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 48.20% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- dovecot/dovecot
- Source
- secalert@redhat.com
EPSS moved from 34.6% on 21 September 2026 to 48.2% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://dovecot.org/pipermail/dovecot-news/2016-December/000333.htmlRelease Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/12/02/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/12/05/12Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/94639Third Party Advisory, VDB Entry
- http://dovecot.org/pipermail/dovecot-news/2016-December/000333.htmlRelease Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/12/02/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/12/05/12Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/94639Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.