CVE-2026-25687

ZCC race condition in ZPA tunnel handler

Published Sep 14, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Zscaler
Zscaler client Connector
Vendors & Products Zscaler
Zscaler client Connector
Type Values Removed Values Added
Description 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.
Title ZCC race condition in ZPA tunnel handler
Weaknesses CWE-366
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Zscaler
Published
Updated
Sep 15, 2026, 3:56 AM
Reserved
Feb 5, 2026, 5:00 AM
Status
Awaiting Analysis
Published
Sep 14, 2026, 3:17 PM
Modified
Sep 18, 2026, 7:08 PM