CVE-2021-31864: Debian Linux

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows attackers to bypass the add_issue_notes permission requirement by leveraging the incoming mail handler.

Affected products

• Debian Debian Linux: version 9.0 only
• Redmine Redmine: before 4.0.9 (fixed in 4.0.9); from 4.1.0, before 4.1.3 (fixed in 4.1.3); from 4.2.0, before 4.2.1 (fixed in 4.2.1)

Published 2021-04-28. Last modified 2026-06-17.