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Fencer Vulns
high 7.5

CVE-2024-6827 json

HTTP Request Smuggling in benoitc/gunicorn

published 2025-03-20 19 mo ago modified 2026-09-10 1 mo ago also GHSA-hc5x-x2vx-497g , PYSEC-2026-1433 , EUVD-2025-6969

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi gunicorn 22.0.0
  • gunicorn Debian 14, Debian 13 23.0.0-1

debian advisories DEBIAN-CVE-2024-6827

  • python-gunicorn SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +7 more 20.1.0-150400.12.9.1
  • python-gunicorn SLE Module for Public Cloud 15 SP6, SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 +1 more 19.7.1-150000.3.10.1

suse advisories SUSE-SU-2025:1008-1SUSE-SU-2025:1002-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-6827 updated cvss 7.5

gunicorn: HTTP Request Smuggling in benoitc/gunicorn

  • Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-func-func-util-rhel8
    affected: workaround, no fix available “Red Hat Product Security currently does not have a recommended mitigation at this time.”
  • Red Hat Discovery 1 for RHEL 9 discovery/discovery-server-rhel9 1.13.1-1
    fixed: vendor fix “Red Hat Product Security currently does not have a recommended mitigation at this time.” RHSA-2025:3709
  • Red Hat Quay v3 quay/quay-rhel8 v3.12.9-8, quay/clair-rhel8 v3.12.9-3, quay/clair-rhel8 v3.13.5-4, quay/clair-rhel8 v3.9.11-5, quay/quay-rhel8 v3.11.10-9, quay/quay-rhel8 v3.13.5-17, +44 more
    fixed: vendor fix “Red Hat Product Security currently does not have a recommended mitigation at this time.” RHBA-2025:3653

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

0.81% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
pypi gunicorn
<22.0.0
22.0.0

Affected products

  • benoitc benoitc/gunicorn

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.