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Undertow Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling) Vulnerability - CVE-2021-20220 - Vulnerability Database
Undertow

Undertow Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling) Vulnerability - CVE-2021-20220

Medium
Reference: CVE-2021-20220
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2021-20220
Title: Undertow Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling) Vulnerability
Overview:

A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. 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. The highest threat from this vulnerability is to data confidentiality and integrity.