Disable Zscaler using machine tunnel restart

published 2023-11-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32437

cvss: 4.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

An Improper Validation of Integrity Check Value in Zscaler Client Connector on Windows allows an authenticated user to disable ZIA/ZPA by interrupting the service restart from Zscaler Diagnostics. This issue affects Client Connector: before 4.2.0.149.

Patch / fix

fixed in 1

Zscaler Client Connector 4.2.0.149

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2023-11-30)

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.9	CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Affected products

Zscaler Client Connector

Classification

Weakness

CWE-354 Improper Validation of Integrity Check Value

References

help.zscaler.com /client-connector/client-connector-app-release-summary-2023?applicable_category=Windows&applicable_version=4.2
release-notes

Sources

CVE List CVE-2023-28802
NVD CVE-2023-28802

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary