What is CVE-2025-62801?

CVE-2025-62801 is a high-severity vulnerability in Jlowin Fastmcp, classified under OS Command Injection. CVSS score: 7.8/10. Published 2025-10-28.

How severe is CVE-2025-62801?

High severity. CVSS v3 base score is 7.8 out of 10.

RCE in Jlowin Fastmcp

CVE-2025-62801

FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0, a command-injection vulnerability lets any attacker who can influence the server_name field of an MCP execute arbitrary OS commands on Windows hosts that run fastmcp install cursor. This vulnerability is fixed in 2.13.0.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.002 (11.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Jlowin Fastmcp — versions < 2.13.0

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-62801?: CVE-2025-62801 is a high-severity vulnerability in Jlowin Fastmcp, classified under OS Command Injection. CVSS score: 7.8/10. Published 2025-10-28.
How severe is CVE-2025-62801?: High severity. CVSS v3 base score is 7.8 out of 10.