The ap_proxy_ajp_request function in mod_proxy_ajp.c in mod_proxy_ajp
in the Apache HTTP Server 2.2.x before 2.2.15 does not properly handle
certain situations in which a client sends no request body, which
allows remote attackers to cause a denial of service (backend server
outage) via a crafted request, related to use of a 500 error code
instead of the appropriate 400 error code.
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