CVE-2021-41838

Name: CVE-2021-41838
Creator: NVD / NIST
Published: 2022-02-03T02:15:07.08+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2021-41838 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. An issue was discovered in SdHostDriver in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

An issue was discovered in SdHostDriver in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of a Numeric Range Comparison Without a Minimum Check.

Metrics

CVSS 3.1

8.2/10

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

EPSS Probability

0.30%

21.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Insyde	Insydeh2o	>= 5.1, < 5.16.42
Insyde	Insydeh2o	>= 5.2, < 5.26.42
Insyde	Insydeh2o	>= 5.3, < 5.35.42
Insyde	Insydeh2o	>= 5.4, < 5.43.42
Insyde	Insydeh2o	>= 5.5, < 5.51.42
Siemens	Simatic Field Pg M5 Firmware	All versions
Siemens	Simatic Field Pg M6 Firmware	All versions
Siemens	Simatic Ipc127e Firmware	All versions
Siemens	Simatic Ipc227g Firmware	All versions
Siemens	Simatic Ipc277g Firmware	All versions
Siemens	Simatic Ipc327g Firmware	All versions
Siemens	Simatic Ipc377g Firmware	All versions
Siemens	Simatic Ipc427e Firmware	All versions
Siemens	Simatic Ipc477e Firmware	All versions
Siemens	Simatic Ipc627e Firmware	All versions
Siemens	Simatic Ipc647e Firmware	All versions
Siemens	Simatic Ipc677e Firmware	All versions
Siemens	Simatic Ipc847e Firmware	All versions
Siemens	Simatic Itp1000 Firmware	All versions

References

https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220222-0001/Third Party Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://www.insyde.com/security-pledge/SA-2022023Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220222-0001/Third Party Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://www.insyde.com/security-pledge/SA-2022023Vendor 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-2021-41838?

How severe is CVE-2021-41838?

CVE-2021-41838 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41838?

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-2021-41838?

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

Scan your code now

Source: NVD / NIST