Vulnerability · Published Sep 3, 2026 · Assigned by Insyde
CVE-2021-43614VariableEditSmm: Error checking of UEFI variables could cause buffer overflow, leading to code execution
Medium 6.7
In plain English
A medium-severity buffer overflow in InsydeH2O from Insyde Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).
Severity (CVSS 3.1)6.7Medium
Exploit odds (30 days)0.2%top 95.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Error in handling the PlatformLangCodes UEFI variable could cause a buffer overflow, leading to resource exhaustion and failure.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Insyde Software | InsydeH2O | InsydeH2OUvePkg – before 01.01.04.0008 |
Weakness: CWE-120 · Vector: CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:L