CVE-2016-20091 Windows Firewall Control 4.8.6.0 Unquoted Service Path Privilege Escalation
Local attackers can escalate privileges to LocalSystem by placing malicious executables in the unquoted service path of Windows Firewall Control.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2016-20091?
CVE-2016-20091 is a high-severity vulnerability in Binisoft Windows Firewall Control, published on 19 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-428
Which versions are affected by CVE-2016-20091?
How do I fix CVE-2016-20091?
No fix has been published for CVE-2016-20091 yet. Limit exposure of the affected software until one is available.
Is CVE-2016-20091 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-20091 exists.
Sources
Also known as GHSA-99jf-rpjr-fwjv.