CVE-2021-47890

8.5 highEPSS 0.1%

High (8.5). EPSS 0.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.5 high

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

CVSS 3.1

7.8 high

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.1% chance of exploitation in the next 30 days; higher than 3% of CVEs (scores of 2026-10-31)
CWE: CWE-428
Published: 2026-01-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

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

Check your stack JSON