CVE-2017-20002: Debian Linux
High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.
The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty. This allows local users to login as password-less users even if they are connected by non-physical means such as SSH (hence bypassing PAM's nullok_secure configuration). This notably affects environments such as virtual machines automatically generated with a default blank root password, allowing all local users to escalate privileges.
Affected products
Published 2021-03-17. Last modified 2026-06-17.