Advisory Published

CVE-2021-41838: Buffer Overflow

First published: Thu Feb 03 2022(Updated: )

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.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
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
Siemens Simatic Field Pg M5
Siemens Simatic Field Pg M6 Firmware
Siemens Simatic Field Pg M6
Siemens Simatic Ipc127e Firmware
Siemens Simatic Ipc127e
Siemens Simatic Ipc227g Firmware
Siemens Simatic Ipc227g
Siemens Simatic Ipc277g Firmware
Siemens Simatic Ipc277g
Siemens Simatic Ipc327g Firmware
Siemens Simatic Ipc327g
Siemens Simatic Ipc377g Firmware
Siemens Simatic Ipc377g
Siemens Simatic Ipc427e Firmware
Siemens Simatic Ipc427e
Siemens Simatic Ipc477e Firmware
Siemens Simatic Ipc477e
Siemens Simatic Ipc627e Firmware
Siemens Simatic Ipc627e
Siemens Simatic Ipc647e Firmware
Siemens Simatic Ipc647e
Siemens Simatic Ipc677e Firmware
Siemens Simatic Ipc677e
Siemens Simatic Ipc847e Firmware
Siemens Simatic Ipc847e
Siemens Simatic Itp1000 Firmware
Siemens Simatic Itp1000

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Frequently Asked Questions

  • What is CVE-2021-41838?

    CVE-2021-41838 refers to an issue in SdHostDriver in the Insyde InsydeH2O kernel versions 5.0 through 5.5, which allows an attacker to access the System Management Mode and execute arbitrary code.

  • How severe is CVE-2021-41838?

    CVE-2021-41838 has a severity rating of 8.2 (high).

  • Which software are affected by CVE-2021-41838?

    Insyde InsydeH2O versions 5.1 through 5.5 are affected by CVE-2021-41838.

  • How can I fix CVE-2021-41838?

    To fix CVE-2021-41838, it is recommended to update the affected Insyde InsydeH2O software to a version beyond 5.5.

  • Where can I find more information about CVE-2021-41838?

    You can find more information about CVE-2021-41838 in the references provided: [link1](https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf), [link2](https://security.netapp.com/advisory/ntap-20220222-0001/), and [link3](https://www.insyde.com/security-pledge).


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