In Go before 1.15.13 and 1.16.x before 1.16.5, some configurations of ReverseProxy (from net/http/httputil) result in a situation where an attacker is able to drop arbitrary headers.
{
"cpes": [
"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*"
],
"severity": "Medium"
}