CVE-2021-43522

Name: CVE-2021-43522
Creator: NVD / NIST
Published: 2022-02-03T00:15:07.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2021-43522 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.26%

17.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Insyde	Insydeh2o	>= 5.1, < 5.14.34
Insyde	Insydeh2o	>= 5.2, < 5.24.34
Insyde	Insydeh2o	>= 5.3, < 5.33.34

References

https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220216-0003/Third Party Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220216-0003/Third Party Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://www.kb.cert.org/vuls/id/796611

Timeline

Published: Feb 3, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43522?

How severe is CVE-2021-43522?

CVE-2021-43522 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43522?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43522?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST