CVE-2021-43614 VariableEditSmm: Error checking of UEFI variables could cause buffer overflow, leading to code execution
A buffer overflow in InsydeH2O firmware allows attackers to execute arbitrary code or cause denial of service via UEFI variable handling.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-43614?
CVE-2021-43614 is a medium-severity memory corruption vulnerability in InsydeH2O, published on 3 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Error in handling the PlatformLangCodes UEFI variable could cause a buffer overflow, leading to resource exhaustion and failure.
Weakness: CWE-120
Which versions are affected by CVE-2021-43614?
How do I fix CVE-2021-43614?
No fix has been published for CVE-2021-43614 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-43614 being exploited?
There is no known exploitation of CVE-2021-43614 in the wild and no public exploit code.
Sources
Also known as GHSA-j24h-m5cw-7785.