Vulnerability in Vllm
CVE-2025-59425
vLLM is an inference and serving engine for large language models (LLMs). Before version 0.11.0rc2, the API key support in vLLM performs validation using a method that was vulnerable to a timing attack. API key validation uses a string comparison that takes longer the more characters the provided API key gets correct. Data analysis across many attempts could allow an attacker to determine when it finds the next correct character in the key sequence. Deployments relying on vLLM's built-in API key validation are vulnerable to authentication bypass using this technique. Version 0.11.0rc2 fixes the issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Vllm — versions 0.11.0
- Vllm-Project Vllm — versions < 0.11.0rc2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/vllm-project/vllm/security/advisories/GHSA-wr9h-g72x-mwhm (Exploit, Vendor Advisory)
- github.com/vllm-project/vllm/commit/ee10d7e6ff5875386c7f136ce8b5f525c8fcef48 (Patch)
- github.com/vllm-project/vllm/blob/4b946d693e0af15740e9ca9c0e059d5f333b1083/vllm… (Product)
- github.com/vllm-project/vllm/releases/tag/v0.11.0 (Release Notes)
Frequently asked questions
- What is CVE-2025-59425?
- CVE-2025-59425 is a high-severity vulnerability in Vllm, classified under CWE-385. CVSS score: 7.5/10. Published 2025-10-07.
- How severe is CVE-2025-59425?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-59425 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.