CVE catalog
CVE-2021-20220
DEBIAN-CVE-2021-20220
- Severity
- Medium · CVSS 4.8
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 1.20% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | undertow | 14 | 1.3.11-1 | vulnerable |
| Debian | undertow | 14 | 1.3.16-1 | vulnerable |
| Debian | undertow | 14 | 1.3.19-1 | vulnerable |
| Debian | undertow | 14 | 1.3.21-1 | vulnerable |
| Debian | undertow | 14 | 1.3.23-1 | vulnerable |
| Debian | undertow | 14 | 1.3.4-1 | vulnerable |
| Debian | undertow | 14 | 1.3.5-1 | vulnerable |
| Debian | undertow | 14 | 1.3.7-1 | vulnerable |
| Debian | undertow | 14 | 1.4.0-1 | vulnerable |
| Debian | undertow | 14 | 1.4.1-1 | vulnerable |
| Debian | undertow | 14 | 1.4.18-1 | vulnerable |
| Debian | undertow | 14 | 1.4.20-1 | vulnerable |
| Debian | undertow | 14 | 1.4.21-1 | vulnerable |
| Debian | undertow | 14 | 1.4.21-2 | vulnerable |
| Debian | undertow | 14 | 1.4.22-1 | vulnerable |
| Debian | undertow | 14 | 1.4.23-1 | vulnerable |
| Debian | undertow | 14 | 1.4.23-2 | vulnerable |
| Debian | undertow | 14 | 1.4.23-3 | vulnerable |
| Debian | undertow | 14 | 1.4.25-1 | vulnerable |
| Debian | undertow | 14 | 1.4.25-2 | vulnerable |
| Debian | undertow | 14 | 1.4.3-1 | vulnerable |
| Debian | undertow | 14 | 1.4.4-1 | vulnerable |
| Debian | undertow | 14 | 1.4.6-1 | vulnerable |
| Debian | undertow | 14 | 1.4.7-1 | vulnerable |
| Debian | undertow | 14 | 1.4.8-1 | vulnerable |
| Debian | undertow | 14 | 2.0.23-1 | vulnerable |
| Debian | undertow | 14 | 2.0.25-1 | vulnerable |
| Debian | undertow | 14 | 2.0.26-1 | vulnerable |
| Debian | undertow | 14 | 2.0.27-1 | vulnerable |
| Debian | undertow | 14 | 2.0.28-1 | vulnerable |
| Debian | undertow | 14 | 2.0.29-1 | vulnerable |
| Debian | undertow | 14 | 2.0.30-1 | vulnerable |
| Debian | undertow | 14 | 2.1.0-1 | vulnerable |
| Debian | undertow | 14 | 2.1.1-1 | vulnerable |
| Debian | undertow | 14 | 2.1.3-1 | vulnerable |
| Debian | undertow | 14 | 2.2.0-1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | undertow | deb | 14 | 2.2.0-1 | Not reported | DEBIAN-CVE-2021-20220 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: