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CVE-2021-43613— SysPasswordDxe: Password hashes are exposed in runtime UEFI variables, leading to escalation of privilege

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.

Siemens SIMATIC是西门子（Siemens）的一款组态软件。 Siemens SIMATIC 存在安全漏洞，该漏洞源于攻击者可以通过UEFI使用Independent BIOS Developers的多个漏洞。

CVSS 6.5 · Medium EPSS 0.13% · P3

Possible ATT&CK Techniques 2 AI

T1005 · Data from Local System T1536

Affected Version Matrix 1

VendorProduct Version RangeStatus
Insyde Software InsydeH2O See in the Solution affected
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I. Basic Information for CVE-2021-43613

Vulnerability Information
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Vulnerability Title
SysPasswordDxe: Password hashes are exposed in runtime UEFI variables, leading to escalation of privilege
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in SysPasswordDxe in Insyde InsydeH2O. User and administrator password hashes are exposed in runtime UEFI variables, leading to escalation of privilege
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
Siemens SIMATIC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Siemens SIMATIC是西门子（Siemens）的一款组态软件。 Siemens SIMATIC 存在安全漏洞，该漏洞源于攻击者可以通过UEFI使用Independent BIOS Developers的多个漏洞。
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 See in the Solution -

II. Public POCs for CVE-2021-43613

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III. Intelligence Information for CVE-2021-43613

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Vendor Advisories for CVE-2021-43613 (1)

Same Patch Batch · Insyde Software · 2026-09-03 · 3 CVEs total

CVE-2021-38489 8.2 HIGH HDD Password Stored In Plaintext
CVE-2021-43614 6.7 MEDIUM VariableEditSmm: Error checking of UEFI variables could cause buffer overflow, leading to

IV. Related Vulnerabilities

Same product: InsydeH2O
Same vendor: Insyde Software
Same weakness: CWE-732