CVE-2024-6827 | HTTP Request Smuggling in benoitc/gunicorn

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.

Published: 2025-03-20 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-6827 is rated Low Risk (35.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-6827

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-30 0.09% 0.05% -0.04%
2 2026-04-29 0.04% 0.09% +0.05%
3 2026-04-28 — 0.04% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-6827

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2024-6827

GitHub Security Advisory for CVE-2024-6827

GHSA-hc5x-x2vx-497g · Severity: high · Ecosystem: pip — Gunicorn HTTP Request/Response Smuggling vulnerability

OS Trackers for CVE-2024-6827

vendor priority summary link
debian not yet assigned CVE-2024-6827 not yet assigned priority: Debian including 1 source packages (gunicorn), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2024-6827
redhat high — https://access.redhat.com/security/cve/CVE-2024-6827
suse high CVE-2024-6827 severity important: SUSE including 234 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 254 product×package rows across 23 product lines (Image SLES15-SP3-BYOS-Azure, Image SLES15-SP3-HPC-BYOS-Azure, … (23 product lines)): Known Affected 231, Fixed 23. https://www.suse.com/security/cve/CVE-2024-6827/
ubuntu medium CVE-2024-6827 medium priority: Ubuntu including 1 source packages (gunicorn), 10 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 8, ignored 2. https://ubuntu.com/security/CVE-2024-6827

Affected software / configurations for CVE-2024-6827

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2024-6827

cvelogic Threat Intelligence