VULNERABILITY INTELLIGENCE

CVE-2021-20220

CVSS score4.8 MEDIUM
EPSS probability1.20%
CISA KEVNot currently listed
Published2021-02-23
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

Weakness classification

  • secalert@redhat.com: CWE-444
  • nvd@nist.gov: CWE-444

Primary references