What’s Vulnerable › Vulnerabilities

CVE-2021-41839

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-03 · updated 2026-08-11
• Weakness: CWE-119

Description

An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

Affected products

• Insydeh2O: from 5.1 before 5.16.25; from 5.2 before 5.26.25; from 5.3 before 5.35.25; from 5.4 before 5.43.25; from 5.5 before 5.51.25 — fixed in 5.16.25, 5.26.25, 5.35.25, 5.43.25, 5.51.25

How to fix

Upgrade to a fixed version: Insydeh2O 5.16.25, 5.26.25, 5.35.25, 5.43.25. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
• https://security.netapp.com/advisory/ntap-20220217-0016/
• https://www.insyde.com/security-pledge
• https://www.insyde.com/security-pledge/SA-2022020
• https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
• https://security.netapp.com/advisory/ntap-20220217-0016/
• https://www.insyde.com/security-pledge
• https://www.insyde.com/security-pledge/SA-2022020
• https://www.kb.cert.org/vuls/id/796611
• https://cert-portal.siemens.com/productcert/html/ssa-306654.html

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