CVE-2017-9525: Cron Project Cron

Medium severity, CVSS 6.7. EPSS: 0.6% chance of exploitation in the next 30 days.

In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-crontab-to-root privilege escalation via symlink attacks against unsafe usage of the chown and chmod programs.

Affected products

• Cron Project Cron: up to and including 3.0pl1-128.
• Debian Debian Linux: version 8.0 only; version 9.0 only

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