What is the CVSS score of CVE-2021-47890?

CVE-2021-47890 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2021-47890?

Yes, a public proof-of-concept exploit is available for CVE-2021-47890. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47890?

Within 24 hours: Identify all systems running LogonExpert 8.1 and assess exposure; isolate affected systems from production networks if possible. Within 7 days: Implement compensating controls (ACL restrictions on Program Files, disable LogonExpert if not critical); contact LogonExpert vendor for patch timeline and workarounds. Within 30 days: Deploy vendor patch immediately upon release or uninstall LogonExpert if alternative solutions exist.

CVE-2021-47890

HIGH

Unquoted Search Path or Element (CWE-428)

2026-01-23 disclosure@vulncheck.com

Information Disclosure

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 26, 2026 - 15:03 vuln.today

Public exploit code

CVE Published

Jan 23, 2026 - 17:15 nvd

HIGH 7.8

DescriptionCVE.org

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.