CVE-2009-3235: Dovecot

High severity, CVSS 7.5. EPSS: 4% chance of exploitation in the next 30 days.

Multiple stack-based buffer overflows in the Sieve plugin in Dovecot 1.0 before 1.0.4 and 1.1 before 1.1.7, as derived from Cyrus libsieve, allow context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted SIEVE script, as demonstrated by forwarding an e-mail message to a large number of recipients, a different vulnerability than CVE-2009-2632.

Affected products

• Dovecot Dovecot: version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1 only; version 1.1.0 only; …

Published 2009-09-17. Last modified 2026-06-16.