CVE-2021-20220
This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own.
Does this matter?
Lower severity and a low EPSS score (1.20%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS
- 1.20% probability · 68th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- redhat/undertow · netapp/active iq unified manager · netapp/oncommand workflow automation
- Source
- secalert@redhat.com
EPSS 1.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1923133Issue Tracking, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20220210-0013/Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1923133Issue Tracking, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20220210-0013/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.