# CVE-2024-6827: gunicorn: Gunicorn version 21.2.0 does not properly validate the value of the 'Transfer-Encoding' header as specified in the RF...

CVE-2024-6827 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2024-6827, released March 20, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-6827
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0081
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 20, 2025

## Description

Gunicorn version 21.2.0 does not properly validate the value of the 'Transfer-Encoding' header as specified in the RFC standards, which leads to the default fallback method of 'Content-Length,' making it vulnerable to TE.CL request smuggling. This vulnerability can lead to cache poisoning, data exposure, session manipulation, SSRF, XSS, DoS, data integrity compromise, security bypass, information leakage, and business logic abuse.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gunicorn Debian 13.5 (trixie) | 23.0.0-1 | [DEBIAN-CVE-2024-6827](https://patchblox.com/security/data/fix/linux/debian-cve-2024-6827.md) | Mar 20, 2025 |
| Linux | gunicorn Debian 14 | 23.0.0-1 | [DEBIAN-CVE-2024-6827](https://patchblox.com/security/data/fix/linux/debian-cve-2024-6827.md) | Mar 20, 2025 |
| Linux | python-gunicorn opensuse-leap 15.6 | 20.1.0-150400.12.9.1 | [SUSE-SU-2025:1008-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1008-1.md) | Mar 25, 2025 |
| Linux | python-gunicorn sles 15.6 | 20.1.0-150400.12.9.1 | [SUSE-SU-2025:1008-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1008-1.md) | Mar 25, 2025 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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