A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).
Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:LA:H8.2/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:HMemory Safety