What’s Vulnerable › Vulnerabilities

CVE-2023-4856

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-15 · updated 2026-06-17
• Weakness: CWE-78

Description

A format string vulnerability was identified in SMM/SMM2 and FPC that could allow an authenticated user to execute arbitrary commands on a specific API endpoint.

Affected products

• Lenovo Fan Power Controller: before fhet62a-3.50 — fixed in fhet62a-3.50
• Lenovo System Management Module Firmware: from 1.24 before tesm40b-1.27 — fixed in tesm40b-1.27

How to fix

Upgrade to a fixed version: Lenovo Fan Power Controller fhet62a-3.50; Lenovo System Management Module Firmware tesm40b-1.27. Check the vendor advisory for mitigations.

References

• https://support.lenovo.com/us/en/product_security/LEN-140420
• https://support.lenovo.com/us/en/product_security/LEN-140420

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