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    CVE-2025-66738

    An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping function of the diagnostic component.

    Published:Dec 26, 2025
    Last Modified:Jan 9, 2026
    EPS:Dec 26, 2025
    EPSS Score:0.00075
    CVSS Score:8.8

    Affected Products

    Vendor
    Yealink
    Product
    Ip Phone Sip-t21p
    Vendor
    Yealink
    Product
    Sip-t21\(p\)e2
    Vendor
    Yealink
    Product
    Sip-t21\(p\)e2 Firmware
    Vendor
    Yealink
    Product
    Sip-t21p E2

    Exploits

    https://drive.google.com/file/d/13t5ywSPJMx4487njJcH3ZTNuc_k3h4ty/view?usp=sharing

    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