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    CVE-2026-21639

    A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product.

    Published:Jan 8, 2026
    Last Modified:Aug 4, 2026
    EPS:Jan 8, 2026
    EPSS Score:0.00347
    CVSS Score:8.8

    Affected Products

    Vendor
    Ubiquiti
    Product
    Airfiber Af60
    Vendor
    Ubiquiti
    Product
    Airfiber Af60 Xg
    Vendor
    Ubiquiti
    Product
    Airmax Ac
    Vendor
    Ubiquiti
    Product
    Airmax M
    Vendor
    Ui
    Product
    Airfiber Af60
    Vendor
    Ui
    Product
    Airfiber Af60-xg
    Vendor
    Ui
    Product
    Airfiber Af60-xg Firmware
    Vendor
    Ui
    Product
    Airfiber Af60 Firmware
    Vendor
    Ui
    Product
    Airmax Ac
    Vendor
    Ui
    Product
    Airmax Ac Firmware
    Vendor
    Ui
    Product
    Airmax M
    Vendor
    Ui
    Product
    Airmax M Firmware

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-100 Overflow Buffers
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-15 Command Delimiters
    CAPEC-183 IMAP/SMTP Command Injection
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-248 Command Injection
    CAPEC-40 Manipulating Writeable Terminal Devices
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-44 Overflow Binary Resource File
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-75 Manipulating Writeable Configuration Files
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities
    CAPEC-92 Forced Integer Overflow

    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