The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
{
    "severity": "High",
    "cpes": [
        "cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*"
    ]
}