CVE-2017-16921: Debian Linux

High severity, CVSS 8.8. EPSS: 19.9% chance of exploitation in the next 30 days.

In OTRS 6.0.x up to and including 6.0.1, OTRS 5.0.x up to and including 5.0.24, and OTRS 4.0.x up to and including 4.0.26, an attacker who is logged into OTRS as an agent can manipulate form parameters (related to PGP) and execute arbitrary shell commands with the permissions of the OTRS or web server user.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Otrs Otrs: version 4.0.1 only; version 4.0.2 only; version 4.0.3 only; version 4.0.4 only; version 4.0.5 only; version 4.0.6 only; …

Published 2017-12-08. Last modified 2026-06-17.