VariableEditSmm: Error checking of UEFI variables could cause buffer overflow, leading to code execution
Summary
| CVE | CVE-2021-43614 |
|---|---|
| State | PUBLISHED |
| Assigner | Insyde |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-03 13:04:12 UTC |
| Updated | 2026-09-03 18:09:03 UTC |
| Description | Error in handling the PlatformLangCodes UEFI variable could cause a buffer overflow, leading to resource exhaustion and failure. |
Risk And Classification
Primary CVSS: v3.1 6.7 MEDIUM from 8338d8cb-57f7-4252-abc0-96fd13e98d21
CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:L
EPSS: 0.001310000 probability, percentile 0.030030000 (date 2026-09-07)
Problem Types: CWE-120 | CWE-120 CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 8338d8cb-57f7-4252-abc0-96fd13e98d21 | Secondary | 6.7 | MEDIUM | CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:L |
| 3.1 | CNA | CVSS | 6.7 | MEDIUM | CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:L |
CVSS v3.1 Breakdown
Attack Vector
PhysicalAttack Complexity
HighPrivileges Required
HighUser Interaction
RequiredScope
ChangedConfidentiality
HighIntegrity
HighAvailability
LowCVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:L
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Insyde Software | InsydeH2O | affected InsydeH2OUvePkg 01.01.04.0008 custom | x86 |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.insyde.com/security-pledge/sa-2022026 | 8338d8cb-57f7-4252-abc0-96fd13e98d21 | www.insyde.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 590981 Siemens Industrial Products Insyde BIOS Multiple Vulnerabilities (SSA-306654)