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CVE-2025-64340— FastMCP has a Command Injection vulnerability - Gemini CLI

Quick assessment

Affected
jlowin fastmcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FastMCP是Jeremiah Lowin个人开发者的一个MCP服务器构建软件。 FastMCP 3.2.0之前版本存在操作系统命令注入漏洞，该漏洞源于包含shell元字符的服务器名称可能导致命令注入，当传递给fastmcp install claude-code或fastmcp install gemini-cli时，在Windows上可能执行任意命令。

CVSS 6.7 · Medium EPSS 0.73% · P52

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2025-64340

Vulnerability Information
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Vulnerability Title
FastMCP has a Command Injection vulnerability - Gemini CLI
Source: CVE Program / CVE List V5
Vulnerability Description
FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, server names containing shell metacharacters (e.g., &) can cause command injection on Windows when passed to fastmcp install claude-code or fastmcp install gemini-cli. These install paths use subprocess.run() with a list argument, but on Windows the target CLIs often resolve to .cmd wrappers that are executed through cmd.exe, which interprets metacharacters in the flattened command string. This issue has been patched in version 3.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
FastMCP 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FastMCP是Jeremiah Lowin个人开发者的一个MCP服务器构建软件。 FastMCP 3.2.0之前版本存在操作系统命令注入漏洞，该漏洞源于包含shell元字符的服务器名称可能导致命令注入，当传递给fastmcp install claude-code或fastmcp install gemini-cli时，在Windows上可能执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jlowin fastmcp < 3.2.0 -

II. Public POCs for CVE-2025-64340

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III. Intelligence Information for CVE-2025-64340

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Patches & Fixes for CVE-2025-64340 (1)

Vendor Advisories for CVE-2025-64340 (1)

IV. Related Vulnerabilities

Same product: fastmcp
Same vendor: jlowin
Same weakness: CWE-78

V. Comments for CVE-2025-64340

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