New version of apache is available for Directadmin and cPanel. So please upgrade the apache to 2.2.20
Changes with Apache 2.2.20
*) SECURITY: CVE-2011-3192 (cve.mitre.org)
core: Fix handling of byte-range requests to use less memory, to avoid
denial of service. If the sum of all ranges in a request is larger than
the original file, ignore the ranges and send the complete file.
PR 51714. [Stefan Fritsch, Jim Jagielski, Ruediger Pluem, Eric Covener]