CVE-2021-33515: Debian Linux

Medium severity, CVSS 4.8. EPSS: 2.9% chance of exploitation in the next 30 days.

The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.

Affected products

• Debian Debian Linux: version 10.0 only
• Dovecot Dovecot: 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.