CVE-2009-4491: Acme Thttpd

Critical severity, CVSS 9.8. EPSS: 13.7% chance of exploitation in the next 30 days.

thttpd 2.25b0 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Affected products

• Acme Thttpd: version 2.25 only

Published 2010-01-13. Last modified 2026-06-16.