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    CVE-2026-25687

    A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.

    Published:Sep 14, 2026
    Last Modified:Sep 15, 2026
    EPS:Sep 14, 2026
    EPSS Score:
    CVSS Score:8.1

    Affected Products

    Vendor
    Zscaler
    Product
    Client Connector

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-366 Race Condition within a Thread

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    CVE-2026-59564 (CVSS 9.1) — An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connec…
    CVE-2026-22569 (CVSS 5.4) — An incorrect startup configuration of affected versions of Zscaler Client Connector on Windows may cause a lim…
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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