The Apache Software Foundation plans to have a fix available in the next day or so for the denial-of-service problem in Apache that was publicized late last week. The bug, which in some forms has been under discussion for more than four years, involves the way that the Web server handles certain overlapping range headers. The vulnerability is considered serious because a remote attacker can essentially take a targeted server offline with little effort and resources. The IETF is looking at ways to fix the range header issue, as well.
Source: https://threatpost.com/apache-plans-range-header-bug-fix-next-day-082611/75583/