# CVE-2021-4020: janus: janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE-2021-4020 is fixed in janus on 1 platform, first by DEBIAN-CVE-2021-4020, released November 27, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-4020
- Priority: Routine
- CVSS: 5.4 (medium)
- EPSS: 0.0085
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 27, 2021

## Description

janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | janus Debian 12.15 (bookworm) | 0.11.5-4 | [DEBIAN-CVE-2021-4020](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4020.md) | Nov 27, 2021 |
| Linux | janus Debian 14 | 0.11.5-4 | [DEBIAN-CVE-2021-4020](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4020.md) | Nov 27, 2021 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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