DEBIAN-CVE-2021-20220

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2021-20220
Published: 23 Feb 2021, 18:15
Last modified:28 Apr 2026, 20:21

Vulnerability Summary

Overall Risk (default)
low
19/100
CVSS Score
4.8 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Feb 2021, 18:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:21
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Systems

  • debian•undertow

    < 2.2.0-1

References (1)