In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in modproxyhttp2.
Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".
{ "severity": "High", "cpes": [ "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*" ] }