CVE-2020-8631: Canonical Cloud-Init

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.

Affected products

• Canonical Cloud-Init: up to and including 19.4
• Debian Debian Linux: version 8.0 only
• Opensuse Leap: version 15.1 only

Published 2020-02-05. Last modified 2026-06-17.