CVE-2021-29157: Dovecot

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Dovecot before 2.3.15 allows ../ Path Traversal. An attacker with access to the local filesystem can trick OAuth2 authentication into using an HS256 validation key from an attacker-controlled location. This occurs during use of local JWT validation with the posix fs driver.

Affected products

• Dovecot Dovecot: from 2.3.11, before 2.3.14.1 (fixed in 2.3.14.1)
• Fedoraproject Fedora: version 33 only; version 34 only

Published 2021-06-28. Last modified 2026-06-17.