CVE-2016-20091Public exploit

LocalSystem code execution via unquoted service path

Published Jun 19, 2026 · Updated Jun 19, 2026

Unquoted service path handling in Binisoft Windows Firewall Control 4.8.6.0 allows local users to execute code as LocalSystem. The _wfcs service registers C:\Program Files\Windows Firewall Control\wfcs.exe without quotation marks, so Windows can resolve an attacker-placed executable earlier in the spaced path. Exploitation requires local write access to a searched directory and a service restart or system reboot; successful execution grants LocalSystem control.

CVSS severity8.5
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unquoted service path handling in Binisoft Windows Firewall Control 4.8.6.0 allows local users to execute code as LocalSystem. The _wfcs service registers C:\Program Files\Windows Firewall Control\wfcs.exe without quotation marks, so Windows can resolve an attacker-placed executable earlier in the spaced path. Exploitation requires local write access to a searched directory and a service restart or system reboot; successful execution grants LocalSystem control.

The record

CVE
CVE-2016-20091
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Binisoft
Product
Windows Firewall Control
Classifications
CWE-428, T1574.009
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.8.6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Binisoft · Windows Firewall Controlversion=4.8.6.0

Published CVSS scores

7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-428Unquoted Search Path or Element
T1574.009Path Interception by Unquoted Path

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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