An integer overflow exists in HAProxy 2.0 through 2.5 in htxaddheader that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.
{
"cpes": [
"cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*"
],
"severity": "High"
}