#VU51518 Inconsistent interpretation of HTTP requests in Undertow - CVE-2021-20220

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Main Vulnerability Database Vulnerabilities #VU51518

#VU51518 Inconsistent interpretation of HTTP requests in Undertow - CVE-2021-20220

Published: March 17, 2021


Vulnerability identifier: #VU51518
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-20220
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Undertow
Software vendor:
Red Hat Inc.

Description

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests when processing HTTP/1.x and HTTP/2  protocols. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.


Remediation

Install updates from vendor's website.

External links