CVE-2021-20220

MEDIUM

Undertow < 2.0.34 and 2.1.0-2.1.6 - HTTP Request Smuggling via Invalid Character Handling

Title source: llm

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.

References (2)

Core 2

Core References

Issue Tracking, Vendor Advisory x_refsource_misc

https://bugzilla.redhat.com/show_bug.cgi?id=1923133

Third Party Advisory x_refsource_confirm

https://security.netapp.com/advisory/ntap-20220210-0013/

Scores

CVSS v3 4.8

EPSS 0.0112

EPSS Percentile 61.8%

Attack Vector NETWORK

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

Details

CWE

CWE-444

Status published

Products (4)

io.undertow/undertow-core 2.1.0 - 2.1.6Maven

netapp/active_iq_unified_manager (3 CPE variants)

netapp/oncommand_workflow_automation

redhat/undertow < 2.0.34

Published Feb 23, 2021

Tracked Since Feb 18, 2026