VariableEditSmm: Error checking of UEFI variables could cause buffer overflow, leading to code execution
Priority LOW 31CWE-120Published · Updated
Key facts
- Attack vector
- Physical
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
Error in handling the PlatformLangCodes UEFI variable could cause a buffer overflow, leading to resource exhaustion and failure.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00151 4th percentileScored 2026-11-07
Fix Fixed InsydeH2O (Insyde Software): 01.01.04.0008
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Insyde Software | InsydeH2O | InsydeH2OUvePkg to before 01.01.04.0008 | 01.01.04.0008 | Patch available | CNA |
- InsydeH2O VendorInsyde Software Affected InsydeH2OUvePkg to before 01.01.04.0008 Fixed in 01.01.04.0008 Patch available CNA
Remediation
- Fix · CNA InsydeH2O (Insyde Software) Fixed in 01.01.04.0008
Timeline
- 2026-10-02 Threatist record created from CVE-2021-43614
- 2026-10-03 Alias added: GHSA-j24h-m5cw-7785
References
More Insyde Software vulnerabilities
- TI-2023-08797 An issue was discovered in ChipsetSvcSmm in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.8
- TI-2022-16772 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2022-16681 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2022-16323 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2022-15984 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2023-08799 An issue was discovered in Insyde InsydeH2O with kernel 5.2 through 5.5. CVSS 3.1HIGH 7.8
Sources
- CVE-2021-43614 · CVE Program
- CVE-2021-43614 · NVD
- FIRST EPSS
- GHSA-j24h-m5cw-7785 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences