CVE-2012-0955: Canonical Software-Properties

High severity, CVSS 7.4. EPSS: 0.6% chance of exploitation in the next 30 days.

software-properties was vulnerable to a person-in-the-middle attack due to incorrect TLS certificate validation in softwareproperties/ppa.py. software-properties didn't check TLS certificates under python2 and only checked certificates under python3 if a valid certificate bundle was provided. Fixed in software-properties version 0.92.

Affected products

• Canonical Software-Properties: before 0.92 (fixed in 0.92)

Published 2020-12-02. Last modified 2026-06-16.