CVE-2020-5956

Name: CVE-2020-5956
Creator: NVD / NIST
Published: 2022-01-05T23:15:07.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2020-5956 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.81%

52.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Insyde	Insydeh2o	>= 5.2, < 5.25.11
Insyde	Insydeh2o	>= 5.1, < 05.15.11
Insyde	Insydeh2o	>= 5.3, < 05.34.11
Insyde	Insydeh2o	>= 5.4, < 05.42.11

References

https://security.netapp.com/advisory/ntap-20220223-0001/Third Party Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://security.netapp.com/advisory/ntap-20220223-0001/Third Party Advisory
https://www.insyde.com/security-pledgeVendor Advisory

Timeline

Published: Jan 5, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5956?

How severe is CVE-2020-5956?

CVE-2020-5956 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5956?

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-2020-5956?

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

Scan your code now

Source: NVD / NIST