CVE-2015-3420: Dovecot

Medium severity, CVSS 5.9. EPSS: 2.8% chance of exploitation in the next 30 days.

The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow remote attackers to cause a denial of service (login process crash) via vectors related to handshake failures.

Affected products

• Dovecot Dovecot: up to and including 2.2.16
• Fedoraproject Fedora: version 20 only; version 21 only; version 22 only

Published 2017-09-19. Last modified 2026-06-17.