---
cve: "CVE-2025-47277"
severity: "CRITICAL"
cvss: 9.8
epss: "96%"
vendor: "vllm-project"
kev: false
exploited: false
published: "2025-05-20 18:15:46"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T10:38:43+02:00"
---

# CVE-2025-47277

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

vLLM, an inference and serving engine for large language models (LLMs), has an issue in versions 0.6.5 through 0.8.4 that ONLY impacts environments using the `PyNcclPipe` KV cache transfer integration with the V0 engine. No other configurations are affected. vLLM supports the use of the `PyNcclPipe` class to establish a peer-to-peer communication domain for data transmission between distributed nodes. The GPU-side KV-Cache transmission is implemented through the `PyNcclCommunicator` class, while CPU-side control message passing is handled via the `send_obj` and `recv_obj` methods on the CPU side.​ The intention was that this interface should only be exposed to a private network using the IP address specified by the `--kv-ip` CLI parameter. The vLLM documentation covers how this must be limited to a secured network. The default and intentional behavior from PyTorch is that the `TCPStore` interface listens on ALL interfaces, regardless of what IP address is provided. The IP address given was only used as a client-side address to use. vLLM was fixed to use a workaround to force the `TCPStore` instance to bind its socket to a specified private interface. As of version 0.8.5, vLLM limits the `TCPStore` socket to the private interface as configured.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- ba41cc90e8ef7f236347b2f1599eec2cbb9e1f0d (Commit)
- 0d6e187e88874c39cda7409cf673f9e6546893e7 (Commit)

## Referenzen

- <https://github.com/vllm-project/vllm/security/advisories/GHSA-hjq4-87xh-g4fv>
- <https://github.com/vllm-project/vllm/pull/15988>
- <https://github.com/vllm-project/vllm/commit/0d6e187e88874c39cda7409cf673f9e6546893e7>
- <https://docs.vllm.ai/en/latest/deployment/security.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-47277) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_