CVE-2009-0033: Input Validation
Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when the Java AJP connector and modjk load balancing are used, allows remote attackers to cause a denial of service (application outage) via a crafted request with invalid headers, related to temporary blocking of connectors that have encountered errors, as demonstrated by an error involving a malformed HTTP Host header.
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Event History
Frequently Asked Questions
What is the severity of CVE-2009-0033?
CVE-2009-0033 has a high severity rating as it can cause denial of service through a crafted request.
How do I fix CVE-2009-0033?
To fix CVE-2009-0033, upgrade Apache Tomcat to a version beyond 6.0.18, 5.5.27, or 4.1.39.
Which versions of Apache Tomcat are affected by CVE-2009-0033?
CVE-2009-0033 affects Apache Tomcat versions 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18.
What type of attack does CVE-2009-0033 facilitate?
CVE-2009-0033 facilitates denial of service attacks that can lead to application outages.
Is there a workaround for CVE-2009-0033 if I can't upgrade?
While upgrading is the best solution for CVE-2009-0033, temporary measures include restricting access to the AJP connector.