An exploit has been released into the wild for Tomcat Connector version jk2-2.0.2. The vulnerability exploited exists in the Host Header field of the apache jk2 module. At this point it’s known to work on Fedora Core versions 6,7, and 8. Other distros will likely also be affected by the exploit. If you are using the legacy 2.0.x tree of the Apache Tomcat Connector, upgrade to version 2.0.4, or use the newest version of mod_jk.
Apache Tomcat Connector Exploit