What’s Vulnerable › Vulnerabilities
CVE-2025-54983: Health check port on ZCC allows tunnel bypass
- Severity: medium (CVSS 5.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-11-12 · updated 2026-10-18
- Weakness: CWE-772
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.
Affected products
- Zscaler Client Connector: from 4.6 before 4.6.0.216; from 4.7 before 4.7.0.47 — fixed in 4.6.0.216, 4.7.0.47
How to fix
Upgrade to a fixed version: Zscaler Client Connector 4.6.0.216, 4.7.0.47. Check the vendor advisory for mitigations.
References
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