CVE-2021-43522 Memory corruption in n/a

High 7.5 Published 2 Feb 2022 Updated 11 Aug 2026

A memory corruption flaw in InsydeH2O BIOS allows attackers to write to SMRAM and escalate privileges to System Management Mode.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-43522?

CVE-2021-43522 is a high-severity memory corruption vulnerability in Insyde Insydeh2o, published on 2 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in Insyde InsydeH2O with kernel 5.1 through 2021-11-08, 5.2 through 2021-11-08, and 5.3 through 2021-11-08. A StorageSecurityCommandDxe SMM memory corruption vulnerability allows an attacker to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

Weakness: CWE-787

Which versions are affected by CVE-2021-43522?

It affects 1 product.

Products include Insyde Insydeh2o.

How do I fix CVE-2021-43522?

No fix has been published for CVE-2021-43522 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-2021-43522 being exploited?

There is no known exploitation of CVE-2021-43522 in the wild and no public exploit code.

All Insyde Insydeh2o vulnerabilities

Sources

Also known as GHSA-gfqr-73mw-r2gj.