CVSS 3.1
4.8 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NCVE-2021-20220
Medium (4.8). EPSS 1.2% chance of exploitation in the next 30 days. Fixed in io.undertow:undertow-core 2.0.34, 2.1.6.
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.
Severity
- EPSS
- 1.2% chance of exploitation in the next 30 days; higher than 68% of CVEs (scores of 2026-10-31)
- CWE
- CWE-444
- Published
- Modified
- Record from
- the NVD, synced
Affected
- netapp:active_iq_unified_manager
- netapp:oncommand_workflow_automation
- redhat:undertow
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-qjwc-v72v-fq6r | Maven | io.undertow:undertow-core | >=2.1.0 <2.1.6 | 2.1.6 |
| GHSA-qjwc-v72v-fq6r | Maven | io.undertow:undertow-core | <2.0.34 | 2.0.34 |