CVE-2005-2540: Flatnuke

Medium severity, CVSS 5.0. EPSS: 6.1% chance of exploitation in the next 30 days.

CRLF injection vulnerability in FlatNuke 2.5.5 and possibly earlier versions allows remote attackers to execute arbitrary PHP commands via an ASCII char 13 (carriage return) in the signature field, which is injected into a PHP script without a preceding comment character, which can then be executed by a direct request.

Affected products

• Flatnuke Flatnuke: version 2.5.5 only

Published 2005-08-10. Last modified 2026-06-16.