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Date: Tue, 04 Dec 2012 19:47:38 +0000
From: Mark Thomas <>
To: Tomcat Users List <>
CC: Tomcat Announce List <>,,
  Tomcat Developers List <>,,
Subject: CVE-2012-4534 Apache Tomcat denial of service

CVE-2012-4534 Apache Tomcat denial of service

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- Tomcat 7.0.0 to 7.0.27
- Tomcat 6.0.0 to 6.0.35

When using the NIO connector with sendfile and HTTPS enabled, if a
client breaks the connection while reading the response an infinite loop
is entered leading to a denial of service. This was originally reported

Users of affected versions should apply one of the following mitigations:
- Tomcat 7.0.x users should upgrade to 7.0.28 or later
- Tomcat 6.0.x users should upgrade to 6.0.36 or later

The security implications of this bug were identified by Arun Neelicattu
of the Red Hat Security Response Team.


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