CVE-2021-43614
Undergoing Analysis Undergoing Analysis - In Progress

Buffer Overflow in UEFI PlatformLangCodes Variable

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: Insyde

Description
Error in handling the PlatformLangCodes UEFI variable could cause a buffer overflow, leading to resource exhaustion and failure.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-15
AI Q&A
2026-09-03
EPSS Evaluated
2026-09-14
NVD
CVE-2021-43614
EUVD
EUVD-2021-34869

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
insyde insydeh2o to 01.01.04.0008 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

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Executive Summary

This vulnerability involves improper handling of the PlatformLangCodes UEFI variable in the VariableEditSmm driver. This flaw can lead to a buffer overflow, causing resource exhaustion and potential system failure.

Detection Guidance

Detection involves checking InsydeH2O firmware versions and inspecting UEFI variables. Compare your system's firmware version against 01.01.04.0008. Use UEFI tools like 'efivar' to examine PlatformLangCodes variable for abnormal values. Check for system crashes or resource exhaustion logs.

Impact Analysis

The vulnerability may cause system instability or failure due to resource exhaustion. It could also lead to unauthorized access or data manipulation if exploited, given its high impact on confidentiality and integrity.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. The vulnerability primarily causes resource exhaustion and system failure due to a buffer overflow in UEFI variable handling, which may lead to unauthorized access or data corruption.

Mitigation Strategies

Update InsydeH2O to version 01.01.04.0008 or later to address the buffer overflow in the VariableEditSmm driver handling PlatformLangCodes UEFI variable.

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