CVE-2023-28803

Name: CVE-2023-28803
Creator: NVD / NIST
Published: 2023-10-23T14:15:09.627+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2023-28803 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9. . EPSS estimates a 0.26% chance of exploitation in the next 30 days.

Description

An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.26%

17.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zscaler	Client Connector	< 3.9

References

Timeline

Published: Oct 23, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-28803?

How severe is CVE-2023-28803?

CVE-2023-28803 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2023-28803?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-28803?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST