SynopsisApache 2.4.x < 2.4.35 Denial of Service
DescriptionAccording to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.35. By sending continuous SETTINGS frames of maximum size an ongoing HTTP/2 connection could be kept busy and would never time out. This can be abused for a DoS on the server. This only affect a server that has enabled the h2 protocol.
Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.
SolutionUpgrade to Apache version 2.4.35 or later.