CVE-2016-20091

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.

CVSS v4.0

8.5 HIGHCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

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

EPSS

0.17% chance of exploitation in the next 30 days, 6th percentile

Published

2026-06-19

Updated

2026-07-15

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/40443

References

• CVE Record
• NVD entry

Related

• CVE-2016-20090
• CVE-2016-20092
• CVE-2016-20089
• CVE-2016-20093
• CVE-2016-20088
• CVE-2016-20094