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CVE-2021-43614

VariableEditSmm: Error checking of UEFI variables could cause buffer overflow, leading to code execution

MEDIUM
6.7
CVSS Score
Published: September 3, 2026 at 02:15 AM UTC
Updated: September 3, 2026 at 06:24 PM UTC
1 product affected across 1 vendorInsydeH2O

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Severity
MEDIUM6.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

InsydeH2O· Insyde
60%
InsydeH2OUvePkg ≤ v < 01.01.04.0008InsydeH2OUvePkg
Affected range stops below 01.01.04.0008, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord
https://www.insyde.com/security-pledge/sa-2022026/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.7MEDIUMInsyde
Attack Vector
PHYSICAL
Complexity
HIGH
Privileges
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW
Vector?

Quick Info

StatusUNDERGOING ANALYSIS
CWE
CWE-120

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