CVE-2011-2766: Debian Linux

High severity, CVSS 7.5. EPSS: 7.2% chance of exploitation in the next 30 days.

The FCGI (aka Fast CGI) module 0.70 through 0.73 for Perl, as used by CGI::Fast, uses environment variable values from one request during processing of a later request, which allows remote attackers to bypass authentication via crafted HTTP headers.

Affected products

• Debian Debian Linux: version 5.0 only; version 6.0 only; version 7.0 only
• Fast Cgi Project Fast Cgi: from 0.70, up to and including 0.73

Published 2011-09-23. Last modified 2026-06-16.