CVE-2007-4568: X.org X Font Server

Medium severity, CVSS 6.8. EPSS: 4% chance of exploitation in the next 30 days.

Integer overflow in the build_range function in X.Org X Font Server (xfs) before 1.0.5 allows context-dependent attackers to execute arbitrary code via (1) QueryXBitmaps and (2) QueryXExtents protocol requests with crafted size values, which triggers a heap-based buffer overflow.

Affected products

• X.org X Font Server: version 1.0.1 only; version 1.0.2 only; version 1.0.4 only

Published 2007-10-05. Last modified 2026-06-16.