CVE-2024-1135

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 84% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. By crafting requests with conflicting Transfer-Encoding headers, attackers can bypass security restrictions and access restricted endpoints. This issue is due to Gunicorn's handling of Transfer-Encoding headers, where it incorrectly processes requests with multiple, conflicting Transfer-Encoding headers, treating them as chunked regardless of the final encoding specified. This vulnerability allows for a range of attacks including cache poisoning, session manipulation, and data exposure.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
85.9%
KEV
Not listed

Published

April 16, 2024

Last Modified

April 15, 2026

References (5)

Vendor Advisories for CVE-2024-1135(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpython-gunicorn-0:22.0.0-1.0.1.el8ui2025-02-12redhat
redhatpython-gunicorn-0:22.0.0-1.el8pc2024-10-10redhat
redhatpython-gunicorn-0:19.9.0-11.el8ost2024-06-24redhat
redhatopenshift4/ose-ironic-rhel9:v4.12.0-202406060836.p0.g9a3e609.assembly.stream.el92024-06-12redhat
redhatpython-gunicorn-0:22.0.0-1.el9ap2024-06-10redhat
redhatopenshift4/ose-ironic-rhel9:v4.14.0-202405161337.p0.g62ee6d0.assembly.stream.el92024-05-30redhat
redhatopenshift4/ose-ironic-rhel9:v4.15.0-202405161507.p0.ge2415c8.assembly.stream.el92024-05-29redhat
redhatopenshift4/ose-ironic-rhel9:v4.13.0-202405072309.p0.g881e793.assembly.stream.el92024-05-23redhat
redhatpython-gunicorn-0:20.0.4-7.el9ost2024-05-22redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
gunicorn0.1 ... 21.2.0 (85 versions)22.0.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 120 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
  2. 2026-07-21 15:23 UTCEPSS rescore
  3. 2026-07-20 17:06 UTCEPSS rescore
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  48. 2026-06-05 06:09 UTCEPSS rescore
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  50. 2026-06-04 23:09 UTCOSV refresh
  51. 2026-06-04 13:11 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2024-1135?
CVE-2024-1135 is a high vulnerability published on April 16, 2024. Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. By crafting requests with conflicting Transfer-Encoding headers, attackers can bypass security restrictions and access restricted endpoints. This issue is due to Gunicorn's…
When was CVE-2024-1135 disclosed?
CVE-2024-1135 was first published in the National Vulnerability Database on April 16, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-1135 actively exploited?
CVE-2024-1135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 85.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-1135?
CVE-2024-1135 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2024-1135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-1135, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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