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Case File

CVE-2021-20220

MEDIUM · CVSS 4.8 EPSS 1.12%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-02-23 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

CVE
CVE-2021-20220
Severity
MEDIUM
CVSS
4.8
EPSS
1.12%

Original NVD 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.