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CVE-2025-4421— EfiSmiServices: gEfiSmmCpuProtocol, SMM memory corruption vulnerabilities in SMM module

Quick assessment

Affected
Insyde Software InsydeH2O
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.

InsydeH2O是中国系微（Insyde）公司的一款可定制固件代码库。 InsydeH2O存在安全漏洞，该漏洞源于SMM模块中的SMM内存损坏。

CVSS 8.2 · High EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2025-4421

Vulnerability Information
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Vulnerability Title
EfiSmiServices: gEfiSmmCpuProtocol, SMM memory corruption vulnerabilities in SMM module
Source: CVE Program / CVE List V5
Vulnerability Description
The vulnerability was identified in the code developed specifically for Lenovo. Please visit "Lenovo Product Security Advisories and Announcements" webpage for more information about the vulnerability.  https://support.lenovo.com/us/en/product_security/home
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
InsydeH2O 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
InsydeH2O是中国系微（Insyde）公司的一款可定制固件代码库。 InsydeH2O存在安全漏洞，该漏洞源于SMM模块中的SMM内存损坏。
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
Insyde Software InsydeH2O Feature developed for Lenovo ~ L05.05.40.011803.172079 -

II. Public POCs for CVE-2025-4421

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III. Intelligence Information for CVE-2025-4421

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Vendor Advisories for CVE-2025-4421 (1)

Same Patch Batch · Insyde Software · 2025-07-30 · 6 CVEs total

CVE-2025-4423 8.2 HIGH SetupAutomationSmm:Vulnerability in the SMM module allow attacker to write arbitrary code
CVE-2025-4422 8.2 HIGH EfiSmiServices : EfiPcdProtocol, SMM memory corruption vulnerabilities in SMM module
CVE-2025-4425 8.2 HIGH SetupAutomationSmm: Stack overflow vulnerability in SMI handler
CVE-2025-4424 6.0 MEDIUM SetupAutomationSmm : Arbitrary calls to SmmSetVariable with unsanitised arguments in SMI h
CVE-2025-4426 6.0 MEDIUM SetupAutomationSmm : SMRAM memory contents leak / information disclosure vulnerability in

IV. Related Vulnerabilities

Same product: InsydeH2O
Same vendor: Insyde Software
Same weakness: CWE-787

V. Comments for CVE-2025-4421

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