What’s Vulnerable › Vulnerabilities

CVE-2020-5956

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-05 · updated 2026-06-17
• Weakness: CWE-20

Description

An issue was discovered in SdLegacySmm in Insyde InsydeH2O with kernel 5.1 before 05.15.11, 5.2 before 05.25.11, 5.3 before 05.34.11, and 5.4 before 05.42.11. The software SMI handler allows untrusted external input because it does not verify CommBuffer.

Affected products

• Insydeh2O: from 5.2 before 5.25.11; from 5.1 before 05.15.11; from 5.3 before 05.34.11; from 5.4 before 05.42.11 — fixed in 05.15.11, 05.34.11, 05.42.11, 5.25.11

How to fix

Upgrade to a fixed version: Insydeh2O 05.15.11, 05.34.11, 05.42.11, 5.25.11. Check the vendor advisory for mitigations.

References

• https://security.netapp.com/advisory/ntap-20220223-0001/
• https://www.insyde.com/security-pledge
• https://security.netapp.com/advisory/ntap-20220223-0001/
• https://www.insyde.com/security-pledge

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