What’s Vulnerable › Vulnerabilities

CVE-2024-8939: Vllm: denials of service in vllm json web api

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-09-17 · updated 2026-06-17
• Weakness: CWE-400

Description

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.

Affected products

• Red Hat Enterprise Linux AI (RHEL AI): all versions

References

• https://access.redhat.com/security/cve/CVE-2024-8939
• https://bugzilla.redhat.com/show_bug.cgi?id=2312782

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