CVE-2025-54983

Health check port on ZCC allows tunnel bypass

Published Nov 12, 2025 CVSS 3.1 · 5.2 Medium EPSS < 1% KEV · Not listed
Description
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.

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
Metrics ssvc

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

Type Values Removed Values Added
First Time appeared Microsoft
Microsoft windows
Zscaler
Zscaler client Connector
Vendors & Products Microsoft
Microsoft windows
Zscaler
Zscaler client Connector
Type Values Removed Values Added
Description 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.
Title Health check port on ZCC allows tunnel bypass
Weaknesses CWE-772
References
Metrics cvssV3_1

{'score': 5.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Zscaler
Published
Updated
Nov 12, 2025, 6:18 PM
Reserved
Aug 4, 2025, 2:51 PM
Status
Deferred
Published
Nov 12, 2025, 4:15 AM
Modified
Oct 18, 2026, 8:10 PM