CVE-2021-20288: Debian Linux

High severity, CVSS 7.2. EPSS: 2.1% chance of exploitation in the next 30 days.

An authentication flaw was found in ceph in versions before 14.2.20. When the monitor handles CEPHX_GET_AUTH_SESSION_KEY requests, it doesn't sanitize other_keys, allowing key reuse. An attacker who can request a global_id can exploit the ability of any user to request a global_id previously associated with another user, as ceph does not force the reuse of old keys to generate new ones. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Linuxfoundation Ceph: before 14.2.21 (fixed in 14.2.21)
• Red Hat Ceph Storage: version 4.0 only

Published 2021-04-15. Last modified 2026-06-17.