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    CVE-2021-33626

    A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.

    Published:Oct 1, 2021
    Last Modified:Aug 11, 2026
    EPS:Oct 1, 2021
    EPSS Score:0.00307
    CVSS Score:7.8

    Affected Products

    Vendor
    Insyde
    Product
    Insydeh2o
    Vendor
    Siemens
    Product
    Ruggedcom Apr1808
    Vendor
    Siemens
    Product
    Ruggedcom Apr1808 Firmware
    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 Ipc477e Pro
    Vendor
    Siemens
    Product
    Simatic Ipc477e Pro 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