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    CVE-2025-20350

    A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to a buffer overflow when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending crafted HTTP input to the device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.

    Published:Oct 15, 2025
    Last Modified:Dec 4, 2025
    EPS:Oct 15, 2025
    EPSS Score:0.00327
    CVSS Score:7.5

    Affected Products

    Vendor
    Cisco
    Product
    Desk Phone 9841
    Vendor
    Cisco
    Product
    Desk Phone 9841 Firmware
    Vendor
    Cisco
    Product
    Desk Phone 9851
    Vendor
    Cisco
    Product
    Desk Phone 9851 Firmware
    Vendor
    Cisco
    Product
    Desk Phone 9861
    Vendor
    Cisco
    Product
    Desk Phone 9861 Firmware
    Vendor
    Cisco
    Product
    Desk Phone 9871
    Vendor
    Cisco
    Product
    Desk Phone 9871 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 7800
    Vendor
    Cisco
    Product
    Ip Phone 7811
    Vendor
    Cisco
    Product
    Ip Phone 7811 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 7821
    Vendor
    Cisco
    Product
    Ip Phone 7821 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 7841
    Vendor
    Cisco
    Product
    Ip Phone 7841 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 7861
    Vendor
    Cisco
    Product
    Ip Phone 7861 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8800
    Vendor
    Cisco
    Product
    Ip Phone 8800 Series
    Vendor
    Cisco
    Product
    Ip Phone 8811
    Vendor
    Cisco
    Product
    Ip Phone 8811 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8821
    Vendor
    Cisco
    Product
    Ip Phone 8821 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8832
    Vendor
    Cisco
    Product
    Ip Phone 8832 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8841
    Vendor
    Cisco
    Product
    Ip Phone 8841 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8845
    Vendor
    Cisco
    Product
    Ip Phone 8845 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8851
    Vendor
    Cisco
    Product
    Ip Phone 8851 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8861
    Vendor
    Cisco
    Product
    Ip Phone 8861 Firmware
    Vendor
    Cisco
    Product
    Ip Phone 8865
    Vendor
    Cisco
    Product
    Ip Phone 8865 Firmware
    Vendor
    Cisco
    Product
    Session Initiation Protocol (sip) Firmware
    Vendor
    Cisco
    Product
    Video Phone 8875
    Vendor
    Cisco
    Product
    Video Phone 8875 Firmware

    Exploits

    No exploit reference

    Common Weakness Enumeration

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    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