CVE-2011-2766

Name: CVE-2011-2766
Creator: NVD / NIST
Published: 2011-09-23T10:55:03.24+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 7.24%

Last modified Jun 16, 2026

CVE-2011-2766 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 7.24% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

7.24%

93.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Fast Cgi Project	Fast Cgi	>= 0.70, <= 0.73
Debian	Debian Linux	5.0
Debian	Debian Linux	6.0
Debian	Debian Linux	7.0

References

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

Timeline

Published: Sep 23, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-2766?

How severe is CVE-2011-2766?

Severity scoring for CVE-2011-2766 is pending analysis. The EPSS model estimates a 7.24% probability of exploitation in the next 30 days.

How do I fix CVE-2011-2766?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-2766?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST