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CVE-2025-4277— Tcg2Smm: improper input validation may lead to arbitrary code execution

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，该漏洞源于可写入SMRAM任意内存并在SMM级别执行任意代码。

CVSS 7.5 · High EPSS 0.14% · P4
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I. Basic Information for CVE-2025-4277

Vulnerability Information
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Vulnerability Title
Tcg2Smm: improper input validation may lead to arbitrary code execution
Source: CVE Program / CVE List V5
Vulnerability Description
Tcg2Smm has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
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，该漏洞源于可写入SMRAM任意内存并在SMM级别执行任意代码。
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 Kernel 5.2 ~ 05.2A.21 -

II. Public POCs for CVE-2025-4277

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III. Intelligence Information for CVE-2025-4277

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Same Patch Batch · Insyde Software · 2025-08-13 · 3 CVEs total

CVE-2025-4276 7.5 HIGH UsbCoreDxe: improper input validation may lead to arbitrary code execution
CVE-2025-4410 7.5 HIGH SetupUtility: A buffer overflow vulnerability leads to arbitrary code execution.

IV. Related Vulnerabilities

Same product: InsydeH2O
Same vendor: Insyde Software
Same weakness: CWE-20

V. Comments for CVE-2025-4277

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