Advisory Published

CVE-2021-41837: Buffer Overflow

First published: Thu Feb 03 2022(Updated: )

An issue was discovered in AhciBusDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Insyde InsydeH2O>=5.0<5.08.41
Insyde InsydeH2O>=5.1<5.16.41
Insyde InsydeH2O>=5.2<5.26.41
Insyde InsydeH2O>=5.3<5.35.41
Insyde InsydeH2O>=5.4<5.43.41
Insyde InsydeH2O>=5.5<5.51.41
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-2021-41837?

    CVE-2021-41837 is a vulnerability in AhciBusDxe in the Insyde InsydeH2O kernel versions 5.0 through 5.5 that allows an attacker to write fixed or predictable data to SMRAM, potentially escalating privileges.

  • How does CVE-2021-41837 affect Insyde InsydeH2O?

    CVE-2021-41837 affects Insyde InsydeH2O versions 5.0 through 5.5 by causing an Untrusted Pointer Dereference that leads to SMM memory corruption.

  • What is the severity of CVE-2021-41837?

    CVE-2021-41837 has a severity rating of 8.2, which is considered high.

  • How can I fix CVE-2021-41837?

    To fix CVE-2021-41837, it is recommended to update to a version of Insyde InsydeH2O that is not affected by the vulnerability.

  • Where can I find more information about CVE-2021-41837?

    More information about CVE-2021-41837 can be found in the references provided: [Siemens CERT-Portal](https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf), [NetApp Advisory](https://security.netapp.com/advisory/ntap-20220222-0003/), [Insyde Security Pledge](https://www.insyde.com/security-pledge).


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