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

published 2024-04-15 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54696

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

lenovo fan_power_controller fhet62a-3.50
lenovo system_management_module_firmware tesm40b-1.27

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-04-19)

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Lenovo SMM, SMM2, FPC
lenovo fan_power_controller
lenovo system_management_module_firmware

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

support.lenovo.com /us/en/product_security/LEN-140420

Sources

CVE List CVE-2023-4856
NVD CVE-2023-4856

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary