CVE-2018-16947: Debian Linux

Critical severity, CVSS 9.8. EPSS: 2.6% chance of exploitation in the next 30 days.

An issue was discovered in OpenAFS before 1.6.23 and 1.8.x before 1.8.2. The backup tape controller (butc) process accepts incoming RPCs but does not require (or allow for) authentication of those RPCs. Handling those RPCs results in operations being performed with administrator credentials, including dumping/restoring volume contents and manipulating the backup database. For example, an unauthenticated attacker can replace any volume's content with arbitrary data.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• Openafs Openafs: before 1.6.23 (fixed in 1.6.23); from 1.8.0, before 1.8.2 (fixed in 1.8.2)

Published 2018-09-12. Last modified 2026-06-17.