Vulnerability in Softros Systems Logonexpert
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (2.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Softros Systems Logonexpert — versions 8.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49586 (exploit)
- www.softros.com/ (product)
- download.logonexpert.com/LogonExpertSetup64.msi (product)
- www.vulncheck.com/advisories/logonexpert-logonexpertsvc-unquoted-service-path (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47890?
- CVE-2021-47890 is a high-severity vulnerability in Softros Systems Logonexpert, classified under Unquoted Search Path or Element. CVSS score: 7.8/10. Published 2026-01-23.
- How severe is CVE-2021-47890?
- High severity. CVSS v3 base score is 7.8 out of 10.