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Vulnerability record · CVE-2021-47890 · published 23 January 2026

CVE-2021-47890: Unquoted search path vulnerability

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.

8.5 CVSS 4.0 High EPSS 0.14% · top 97.3% CWE-428 · Unquoted search path Deferred
8.5CVSS 4.0 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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/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:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2021-47890), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.