TI-2024-08299 Aliases CVE-2024-8939 GHSA-wc36-9694-f9rf

Vllm: denials of service in vllm json web api

LOW 27CWE-400Published 2024-09-17 · Updated 2025-11-20

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

A vulnerability was found in the ilab model serve component, where improper handling of the best_of parameter in the vllm JSON web API can lead to a Denial of Service (DoS). The API used for LLM-based sentence or chat completion accepts a best_of parameter to return the best completion from several options. When this parameter is set to a large value, the API does not handle timeouts or resource exhaustion properly, allowing an attacker to cause a DoS by consuming excessive system resources. This leads to the API becoming unresponsive, preventing legitimate users from accessing the service.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00233 14th percentileScored 2026-11-07

Fix Partial vllm: 0.5.0.post1Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	vllm	before 0.5.0.post1	0.5.0.post1	Patch available	CNA
Red Hat	Red Hat Enterprise Linux AI (RHEL AI)	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux AI (RHEL AI)	—	—	No fix listed	CNA
—	vllm (PyPI)	up to 0.5.0.post1	—	No fix listed	GHSA-wc36-9694-f9rf

vllm Vendor— Affected before 0.5.0.post1 Fixed in 0.5.0.post1 Patch available CNA
Red Hat Enterprise Linux AI (RHEL AI) VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux AI (RHEL AI) VendorRed Hat Affected — Fixed in — No fix listed CNA
vllm (PyPI) Vendor— Affected up to 0.5.0.post1 Fixed in — No fix listed GHSA-wc36-9694-f9rf

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:/a:redhat:enterprise_linux_ai:1	1	—	Red Hat

cpe:/a:redhat:enterprise_linux_ai:1 Versions 1 — ·Red Hat

Remediation

Fix · CNA vllm Fixed in 0.5.0.post1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux AI (RHEL AI)	Affected	No fix planned: Will not fix

Timeline

2026-10-02 Threatist record created from CVE-2024-8939
2026-10-03 Alias added: GHSA-wc36-9694-f9rf

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2024-8939

Other 4

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TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences