Advisory Published

CVE-2021-33625: Buffer Overflow

First published: Thu Feb 03 2022(Updated: )

An issue was discovered in Kernel 5.x in Insyde InsydeH2O, affecting HddPassword. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Insyde InsydeH2O>=5.1<5.16.23
Insyde InsydeH2O>=5.2<5.26.23
Insyde InsydeH2O>=5.3<5.35.23
Insyde InsydeH2O>=5.4<5.43.22
Insyde InsydeH2O>=5.5<5.51.22
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Siemens Ruggedcom Ape1808 Firmware
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Frequently Asked Questions

  • What is CVE-2021-33625?

    CVE-2021-33625 is an issue in Kernel 5.x in Insyde InsydeH2O that affects HddPassword and allows the use of SMRAM, MMIO, or OS kernel addresses.

  • What software versions are affected by CVE-2021-33625?

    CVE-2021-33625 affects versions 5.1 to 5.51.22 of Insyde InsydeH2O.

  • What is the severity of CVE-2021-33625?

    CVE-2021-33625 has a severity score of 7.5 (High).

  • How can I fix CVE-2021-33625?

    To fix CVE-2021-33625, update Insyde InsydeH2O to a version beyond 5.51.22.

  • Where can I find more information about CVE-2021-33625?

    You can find more information about CVE-2021-33625 in the following references: [Siemens CERT-SSA-306654](https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf), [Netapp Advisory NTAP-20220222-0004](https://security.netapp.com/advisory/ntap-20220222-0004/), [Insyde Security Pledge](https://www.insyde.com/security-pledge).


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