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    CVE-2021-33627

    An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. 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.

    Published:Feb 3, 2022
    Last Modified:Aug 11, 2026
    EPS:Feb 3, 2022
    EPSS Score:0.00327
    CVSS Score:8.2

    Affected Products

    Vendor
    Insyde
    Product
    Insydeh2o
    Vendor
    Siemens
    Product
    Simatic Field Pg M5
    Vendor
    Siemens
    Product
    Simatic Field Pg M5 Firmware
    Vendor
    Siemens
    Product
    Simatic Field Pg M6
    Vendor
    Siemens
    Product
    Simatic Field Pg M6 Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc127e
    Vendor
    Siemens
    Product
    Simatic Ipc127e Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc227g
    Vendor
    Siemens
    Product
    Simatic Ipc227g Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc277g
    Vendor
    Siemens
    Product
    Simatic Ipc277g Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc327g
    Vendor
    Siemens
    Product
    Simatic Ipc327g Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc377g
    Vendor
    Siemens
    Product
    Simatic Ipc377g Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc427e
    Vendor
    Siemens
    Product
    Simatic Ipc427e Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc477e
    Vendor
    Siemens
    Product
    Simatic Ipc477e Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc627e
    Vendor
    Siemens
    Product
    Simatic Ipc627e Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc647e
    Vendor
    Siemens
    Product
    Simatic Ipc647e Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc677e
    Vendor
    Siemens
    Product
    Simatic Ipc677e Firmware
    Vendor
    Siemens
    Product
    Simatic Ipc847e
    Vendor
    Siemens
    Product
    Simatic Ipc847e Firmware
    Vendor
    Siemens
    Product
    Simatic Itp1000
    Vendor
    Siemens
    Product
    Simatic Itp1000 Firmware

    Exploits

    No exploit reference

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High