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5.0

Dovecot IMAP can be crashed by malformed APPEND request

CVE-2013-2111 · published 12 years ago
Summary

Versions of Dovecot before 2.2.2 that handle email via IMAP can be forced into an endless loop when they receive a badly formed APPEND command. This consumes server CPU and can make the mail service unavailable. Upgrade Dovecot to version 2.2.2 or later, or apply the vendor's patch, to stop the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
dovecot dovecot <= 2.2.1
2.2
2.2.0
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
Original advisory text
The IMAP functionality in Dovecot before 2.2.2 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via invalid APPEND parameters.
The IMAP functionality in Dovecot before 2.2.2 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via invalid APPEND parameters.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.0 Medium
Exploitation
2% chance of attack within 30 days
Type
CWE-20Improper Input Validation
Timeline
Published27 May 2014
Updated29 Oct 2026
First seen29 Sep 2026
Sources
CVE-2013-2111 · NVD
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