CVE-2021-47890

LogonExpert 8.1 - 'LogonExpertSvc' Unquoted Service Path

CVSS 8.5 HIGHEPSS 0.1%CWE-428

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.5EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

23 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

Softros Systems · LogonExpert

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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