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    CVE-2025-13476

    Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0–v25.8.1.0 uses a static and predictable TLS ClientHello fingerprint lacking extension diversity, allowing Deep Packet Inspection (DPI) systems to trivially identify and block proxy traffic, undermining censorship circumvention. (CWE-327)

    Published:Mar 5, 2026
    Last Modified:Mar 10, 2026
    EPS:Mar 5, 2026
    EPSS Score:0.00051
    CVSS Score:9.8

    Affected Products

    Vendor
    Rakuten
    Product
    Viber
    Vendor
    Rakuten Viber
    Product
    Rakuten Viber Cloak - Android
    Vendor
    Rakuten Viber
    Product
    Rakuten Viber Cloak - Windows

    Exploits

    No exploit reference

    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