CVE-2013-4559: Debian Linux

High severity, CVSS 7.6. EPSS: 10.7% chance of exploitation in the next 30 days.

lighttpd before 1.4.33 does not check the return value of the (1) setuid, (2) setgid, or (3) setgroups functions, which might cause lighttpd to run as root if it is restarted and allows remote attackers to gain privileges, as demonstrated by multiple calls to the clone function that cause setuid to fail when the user process limit is reached.

Affected products

• Debian Debian Linux: version 6.0 only; version 7.0 only; version 8.0 only
• Lighttpd Lighttpd: before 1.4.33 (fixed in 1.4.33)
• Opensuse Opensuse: version 12.2 only; version 12.3 only; version 13.1 only

Published 2013-11-20. Last modified 2026-06-16.