Is CVE-2023-28802 in the CISA KEV catalog?

No. CVE-2023-28802 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-28802?

CVE-2023-28802 has a CVSS v3 base score of 4.9 (MEDIUM).

What is the EPSS score for CVE-2023-28802?

CVE-2023-28802 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-28802?

Upgrade client connector to 4.2.0.149 or later.

CVE & CISA-KEV Catalog

CVE-2023-28802

MEDIUM

4.9

CVSS v3

NVD

Description

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.

CWE-354

How to fix

Remediation Available

client connectorNVD

Affected:< 4.2.0.149Fixed in:4.2.0.149CVE-2023-28802derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorPhysical

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Release Notes1

help.zscaler.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-01-06.