CVE-2001-0955: Buffer overflow in fbglyph.c in XFree86 before 4.2.0, related to glyph clipping for large origins, allows a...

Security readout for executives and security teams

CVE-2001-0955 is an old XFree86 flaw in font glyph handling. A malformed or unusually large text input could crash the X server, disrupting graphical sessions. The CVE also says privilege gain may be possible, but the provided sources do not quantify that risk or confirm real-world exploitation. Exposure is mainly legacy Unix/Linux systems still running XFree86 before 4.2.0. Modern systems using maintained X.Org or Wayland stacks are unlikely to be affected unless they include vulnerable XFree86-derived code, which the provided bundle does not establish. Treat this as a legacy exposure issue, not a broad modern emergency. If any business-critical system still runs XFree86 before 4.2.0, prioritize upgrade or retirement because a graphical-session crash can disrupt operations and the CVE notes possible privilege impact. Mitigation focus: Upgrade XFree86 to 4.2.0 or a vendor-supported fixed package.; Retire unsupported systems that still run legacy XFree86 releases.; Check OS vendor advisories before assuming modern X stacks are affected..

Prepared

Jul 1, 2026, 08:27 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.