CVE-2021-20220

MediumCVSS 4.8/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-444

Affected software

No affected versions have been published.

Timeline

Published
Feb 23, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-20220: Medium severity, CVSS 4.8 | Vulnix