Vulnerability · Published Nov 12, 2025 · Assigned by Zscaler
CVE-2025-54983Health check port on ZCC allows tunnel bypass
Medium 5.2
In plain English
A medium-severity security flaw in Zscaler Client Connector from Zscaler. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)5.2Medium
Exploit odds (30 days)0.1%top 97.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zscaler | Zscaler Client Connector | 4.6 – before 4.6.0.2164.7 – before 4.7.0.47 |
Weakness: CWE-772 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N