What’s Vulnerable › Vulnerabilities

CVE-2021-47890: LogonExpert 8.1 - 'LogonExpertSvc' Unquoted Service Path

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-23 · updated 2026-06-17
• Weakness: CWE-428

Description

LogonExpert 8.1 contains an unquoted service path vulnerability in the LogonExpertSvc service running with LocalSystem privileges. Attackers can exploit the unquoted path to place malicious executables in intermediate directories, potentially gaining elevated system access during service startup.

Affected products

• Softros Systems LogonExpert: 8.1

References

• https://download.logonexpert.com/LogonExpertSetup64.msi
• https://www.exploit-db.com/exploits/49586
• https://www.softros.com/
• https://www.vulncheck.com/advisories/logonexpert-logonexpertsvc-unquoted-service-path

Get alerted when CVE-2021-47890 or the next vulnerability affects your stack