A flaw was discovered in all versions of Undertow before Undertow 2.2.0.Final, where HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own.
{ "nvd_published_at": "2020-09-23T13:15:00Z", "cwe_ids": [ "CWE-444" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2021-04-28T16:14:25Z" }