Local privilege escalation via unquoted service path
Published Jan 21, 2026 · Updated Jan 21, 2026
Privilege escalation in Honeywell WIN-PAK 4.8 allows local users to execute code as LocalSystem through an unquoted service path. GuardTourService registers C:\Program Files \WINPAKPRO\WP GuardTour Service.exe without quotes, so Windows can resolve an attacker-placed executable earlier in the path. Exploitation requires write access to a searched path location and execution during service startup or system reboot.
Summary
What happened
Privilege escalation in Honeywell WIN-PAK 4.8 allows local users to execute code as LocalSystem through an unquoted service path. GuardTourService registers C:\Program Files \WINPAKPRO\WP GuardTour Service.exe without quotes, so Windows can resolve an attacker-placed executable earlier in the path. Exploitation requires write access to a searched path location and execution during service startup or system reboot.
The record
- CVE
- CVE-2021-47866
- Published
- Jan 21, 2026
- Updated
- Jan 21, 2026
- Vendor
- Honeywell Technologies
- Product
- WIN-PAK
- Classifications
- CWE-428, T1574.009
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 21, 2026CVE publishedPublication date reported by the CVE source.
- Jan 21, 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.
- Affected versionversion=4.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Winpakpro 4.8 GuardTourService Unquoted Service Pathproof of concept · demonstrated
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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