CVE-2025-59032: Dovecot

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known.

Affected products

• Dovecot Dovecot: before 2.4.3 (fixed in 2.4.3)
• Open-Xchange Dovecot: before 3.1.3 (fixed in 3.1.3)

Published 2026-03-27. Last modified 2026-10-07.