CVE-2003-0063: The xterm terminal emulator in XFree86 4.2.0 and earlier allows attackers to modify the window title via a...

Security readout for executives and security teams

A vulnerable xterm could be tricked by malicious terminal-control text into placing attacker-controlled content back into a user’s command line. If the user then runs it, this could lead to arbitrary command execution. This mainly matters for legacy Unix/Linux environments still using XFree86 4.2.0 or earlier. Exposure is most likely in old Unix/Linux desktop or server environments that still ship or preserve XFree86 4.2.0 or earlier xterm packages. Modern systems are unlikely to be exposed unless legacy images, appliances, or archived builds remain in use. Prioritize if the organization operates legacy Unix/Linux environments, old appliances, or preserved build images. For fully modern fleets, urgency is lower but still worth confirming because terminal tooling often persists unnoticed on administrative systems. Mitigation focus: Apply vendor xterm or XFree86 updates from Debian and Red Hat advisories.; Retire XFree86 4.2.0 and earlier where still present.; Avoid using vulnerable xterm builds for untrusted text or file viewing..

Prepared

May 24, 2026, 09:54 UTC (UTC+00:00)

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