CVE-2021-47890

HIGH EPSS 2.2%

Published Jan 23, 20265mo ago · Modified Jun 17, 20262w ago

8.5 CVSS 4.0

High

Published Jan 23, 2026 5mo ago

Last Modified Jun 17, 2026 2w ago

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 Details

Base Score

8.5

Exploitability

—

Impact

—

Vector string

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:X/V:X/RE:X/U:X

Attack Vector Local

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

2.2% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-428

References 4

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.