NIST lists all versions prior to 7.0.28 as vulnerable. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-5568 RedHat is also tracking this. https://bugzilla.redhat.com/show_bug.cgi?id=880011
Quoting [1] "Note that all networked servers are subject to denial of service attacks, and we cannot promise magic workarounds to generic problems (such as a client streaming lots of data to your server, or re-requesting the same URL repeatedly). In general our philosophy is to avoid any attacks which can cause the server to consume resources in a non-linear relationship to the size of inputs." Also, this was discussed on the users mailing list [2] many years ago. [1] http://tomcat.apache.org/security.html [2] http://tomcat.markmail.org/thread/7pjy3f3n3gasclih