It was discovered in Undertow that the code that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.
{
"nvd_published_at": null,
"severity": "MODERATE",
"cwe_ids": [
"CWE-444"
],
"github_reviewed_at": "2020-06-16T21:45:55Z",
"github_reviewed": true
}