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    CVE-2025-54983

    A health check port on Zscaler Client Connector on Windows, versions 4.6 < 4.6.0.216 and 4.7 < 4.7.0.47, which under specific circumstances was not released after use, allowed traffic to potentially bypass ZCC forwarding controls.

    Published:Nov 12, 2025
    Last Modified:Apr 15, 2026
    EPS:Nov 12, 2025
    EPSS Score:0.00013
    CVSS Score:5.2

    Affected Products

    Vendor
    Microsoft
    Product
    Windows
    Vendor
    Zscaler
    Product
    Client Connector

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-469 HTTP DoS

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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