CVE-2011-2766

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2011-09-23 · updated 2026-06-16
Weakness: CWE-287

Description

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 Linux: 5.0, 6.0, 7.0
Fast Cgi Project Fast Cgi: from 0.70 through 0.73

References

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=607479
http://www.debian.org/security/2011/dsa-2327
http://www.mandriva.com/security/advisories?name=MDVSA-2012:001
http://www.openwall.com/lists/oss-security/2011/09/08/1
http://www.openwall.com/lists/oss-security/2011/09/08/2
http://www.securityfocus.com/bid/49549
https://bugzilla.redhat.com/show_bug.cgi?id=736604
https://exchange.xforce.ibmcloud.com/vulnerabilities/69709
https://hermes.opensuse.org/messages/13154637
https://hermes.opensuse.org/messages/13155253
https://rt.cpan.org/Public/Bug/Display.html?id=68380
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=607479

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