What’s Vulnerable › Vulnerabilities

CVE-2021-43323

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-03 · updated 2026-08-11

Description

An issue was discovered in UsbCoreDxe in Insyde InsydeH2O with kernel 5.5 before 05.51.45, 5.4 before 05.43.45, 5.3 before 05.35.45, 5.2 before 05.26.45, 5.1 before 05.16.45, and 5.0 before 05.08.45. An SMM callout vulnerability allows an attacker to hijack execution flow of code running in System Management Mode. Exploiting this issue could lead to escalating privileges to SMM.

Affected products

• Insydeh2O: from 5.1 before 5.16.45; from 5.2 before 5.26.45; from 5.3 before 5.33.45; from 5.0 before 5.08.45; from 5.4 before 5.43.45; from 5.5 before 5.51.45 — fixed in 5.08.45, 5.16.45, 5.26.45, 5.33.45, 5.43.45, 5.51.45

How to fix

Upgrade to a fixed version: Insydeh2O 5.08.45, 5.16.45, 5.26.45, 5.33.45. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
• https://security.netapp.com/advisory/ntap-20220217-0013/
• https://www.insyde.com/security-pledge
• https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
• https://security.netapp.com/advisory/ntap-20220217-0013/
• https://www.insyde.com/security-pledge
• https://www.kb.cert.org/vuls/id/796611
• https://cert-portal.siemens.com/productcert/html/ssa-306654.html

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