CVE-2021-47890

HIGH

LogonExpert 8.1 - Privilege Escalation

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47890. PoCs published by Victor Mondragón.

AI-analyzed exploit summary This is a technical writeup detailing an unquoted service path vulnerability in LogonExpert 8.1. The vulnerability allows local privilege escalation due to the service path containing spaces and lacking quotes, enabling an attacker to place a malicious executable in the path.

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.

Exploits (1)

exploitdb WRITEUP
by Victor Mondragón · textlocalwindows
https://www.exploit-db.com/exploits/49586

This is a technical writeup detailing an unquoted service path vulnerability in LogonExpert 8.1. The vulnerability allows local privilege escalation due to the service path containing spaces and lacking quotes, enabling an attacker to place a malicious executable in the path.

Classification
Writeup 90%
Attack Type
Lpe
Complexity
Trivial
Reliability
Reliable
Target: LogonExpert 8.1
Auth required
Prerequisites: Local access to the system · Ability to write to the directory structure where the unquoted path is located
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit, Third Party Advisory exploit
https://www.exploit-db.com/exploits/49586
Various Sources product
https://www.softros.com/

Scores

CVSS v3 7.8
EPSS 0.0012
EPSS Percentile 2.1%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-428
Status published
Published Jan 23, 2026
Tracked Since Feb 18, 2026