CVE-2009-3525: Xen

High severity, CVSS 7.2. EPSS: 1.2% chance of exploitation in the next 30 days.

The pyGrub boot loader in Xen 3.0.3, 3.3.0, and Xen-3.3.1 does not support the password option in grub.conf for para-virtualized guests, which allows attackers with access to the para-virtualized guest console to boot the guest or modify the guest's kernel boot parameters without providing the expected password.

Affected products

• Xen Xen: version 3.0.3 only; version 3.3.0 only; version 3.3.1 only

Published 2009-10-05. Last modified 2026-06-16.