HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.
{
"severity": "High",
"cpes": [
"cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*"
]
}