CVE-2025-47277Public exploitNetwork attack vector

Remote code execution via unsafe pickle deserialization

Published May 20, 2025 · Updated May 20, 2025

Unsafe deserialization in vLLM 0.6.5 through 0.8.4 allows remote attackers to execute code through an exposed PyNcclPipe service. PyNcclPipe metadata reaches StatelessProcessGroup.recv_obj, which passes client-provided bytes directly to pickle.loads; TCPStore also listens on every interface instead of the configured address. Exploitation requires the V0 engine with PyNcclPipe KV-cache transfer enabled, but it requires no authentication and grants control of the server process.

CVSS severity9.8
Critical
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in vLLM 0.6.5 through 0.8.4 allows remote attackers to execute code through an exposed PyNcclPipe service. PyNcclPipe metadata reaches StatelessProcessGroup.recv_obj, which passes client-provided bytes directly to pickle.loads; TCPStore also listens on every interface instead of the configured address. Exploitation requires the V0 engine with PyNcclPipe KV-cache transfer enabled, but it requires no authentication and grants control of the server process.

The record

CVE
CVE-2025-47277
Published
May 20, 2025
Updated
May 20, 2025
Vendor
vLLM Project
Product
vLLM
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.6.5, < 0.8.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

vLLM Project · vLLMversion=>= 0.6.5, < 0.8.5

Published CVSS scores

9.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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