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    CVE-2021-33478

    The TrustZone implementation in certain Broadcom MediaxChange firmware could allow an unauthenticated, physically proximate attacker to achieve arbitrary code execution in the TrustZone Trusted Execution Environment (TEE) of an affected device. This, for example, affects certain Cisco IP Phone and Wireless IP Phone products before 2021-07-07. Exploitation is possible only when the attacker can disassemble the device in order to control the voltage/current for chip pins.

    Published:Jul 22, 2021
    Last Modified:Nov 21, 2024
    EPS:Jul 22, 2021
    EPSS Score:0.00133
    CVSS Score:6.8

    Affected Products

    Vendor
    Cisco
    Product
    Ip Phone 8800 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8800 Series With Multiplatform Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8811 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8811 With Multiplatform Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8841 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8841 With Multiplatform Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8845 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8845 With Multiplatform Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8851 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8851 With Multiplatform Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8861 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8861 With Multiplatform Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8865 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8865 With Multiplatform Firmware
    Vendor
    Cisco
    Product
    Wireless Ip Phone 8821 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