What is CVE-2021-43522?

CVE-2021-43522 is a vulnerability 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. It allows an attacker to write fixed or predictable data to SMRAM, potentially leading to escalation of privileges.

How can an attacker exploit CVE-2021-43522?

An attacker can exploit CVE-2021-43522 by leveraging the StorageSecurityCommandDxe SMM memory corruption vulnerability to write fixed or predictable data to SMRAM, which may allow them to escalate privileges.

What is the severity of CVE-2021-43522?

CVE-2021-43522 has a severity rating of 7.5 (high).

Which software versions are affected by CVE-2021-43522?

Insyde InsydeH2O versions 5.1 through 5.14.34, 5.2 through 5.24.34, and 5.3 through 5.33.34 are affected by CVE-2021-43522.

Where can I find more information about CVE-2021-43522?

You can find more information about CVE-2021-43522 in the following references: [https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf](https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf), [https://security.netapp.com/advisory/ntap-20220216-0003/](https://security.netapp.com/advisory/ntap-20220216-0003/), [https://www.insyde.com/security-pledge](https://www.insyde.com/security-pledge)

Vulnerability/
CVE-2021-43522

high

7.5

CWE

787

2/2/2022

4/8/2024

CVE-2021-43522

First published: Wed Feb 02 2022(Updated: )

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.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Insyde InsydeH2O	>=5.1<5.14.34
Insyde InsydeH2O	>=5.2<5.24.34
Insyde InsydeH2O	>=5.3<5.33.34

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Frequently Asked Questions

What is CVE-2021-43522?
CVE-2021-43522 is a vulnerability 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. It allows an attacker to write fixed or predictable data to SMRAM, potentially leading to escalation of privileges.
How can an attacker exploit CVE-2021-43522?
An attacker can exploit CVE-2021-43522 by leveraging the StorageSecurityCommandDxe SMM memory corruption vulnerability to write fixed or predictable data to SMRAM, which may allow them to escalate privileges.
What is the severity of CVE-2021-43522?
CVE-2021-43522 has a severity rating of 7.5 (high).
Which software versions are affected by CVE-2021-43522?
Insyde InsydeH2O versions 5.1 through 5.14.34, 5.2 through 5.24.34, and 5.3 through 5.33.34 are affected by CVE-2021-43522.
Where can I find more information about CVE-2021-43522?
You can find more information about CVE-2021-43522 in the following references: [https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf](https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf), [https://security.netapp.com/advisory/ntap-20220216-0003/](https://security.netapp.com/advisory/ntap-20220216-0003/), [https://www.insyde.com/security-pledge](https://www.insyde.com/security-pledge)

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version/insyde insydeh2o/5.1
version/insyde insydeh2o/5.2
version/insyde insydeh2o/5.3

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