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Date: February 23, 2021
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.
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')CWE-444
Upgrade to version io.undertow:undertow-core:2.0.34.Final,2.1.6.Final
|Attack Vector (AV):||NETWORK|
|Attack Complexity (AC):||HIGH|
|Privileges Required (PR):||NONE|
|User Interaction (UI):||NONE|
|Access Vector (AV):||NETWORK|
|Access Complexity (AC):||MEDIUM|