Note:

* SECURITY: CVE-2011-3348 (cve.mitre.org)

  mod_proxy_ajp when combined with mod_proxy_balancer: Prevents unrecognized
  HTTP methods from marking ajp: balancer members in an error state, avoiding
  denial of service.

* SECURITY: CVE-2011-3192 (cve.mitre.org)

  core: Further fixes to the handling of byte-range requests to use less
  memory, to avoid denial of service. This patch includes fixes to the patch
  introduced in release 2.2.20 for protocol compliance, as well as the
  MaxRanges directive.