CVE-2025-54983: Health check port on ZCC allows tunnel bypass
Medium · CVSS 5.2 (CVSS 3.1)EPSS 0.13%, 3th percentilePublished Updated Assigner: Zscaler
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.
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N · CWE-772
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Zscaler: Zscaler Client Connector
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2025 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)