CVE-2021-47890

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 v4.0

8.5 HIGHCVSS: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

CVSS v3.1

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

EPSS

0.12% chance of exploitation in the next 30 days, 2th percentile

Published

2026-01-23

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/49586

References

• CVE Record
• NVD entry

Related

• CVE-2021-47889
• CVE-2021-47891
• CVE-2021-47888
• CVE-2021-47892
• CVE-2021-47887
• CVE-2021-47893