UBUNTU-CVE-2021-20220
Advisory lineage Upstream: 1 Downstream: 0
Upstream
Published: 23 Feb 2021, 18:15
Last modified:20 May 2026, 16:04
Vulnerability Summary
Overall Risk (default)
low
19/100 CVSS Score
4.8 MEDIUM
3.1 (osv_ubuntu)
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
20 May 2026, 16:04
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
- ubuntu•undertow
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