LogonExpert 8.1 - 'LogonExpertSvc' Unquoted Service Path
Priority HIGH 72CWE-428Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-428.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00143 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Softros Systems | LogonExpert | 8.1 | — | No fix listed | CNA |
- LogonExpert VendorSoftros Systems Affected 8.1 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-47890
- 2026-10-03 Alias added: GHSA-6xfm-hcmf-ch35
References
Exploit 1
More Softros Systems vulnerabilities
- TI-2021-22503 Softros LAN Messenger 9.6.4 - 'SoftrosSpellChecker' Unquoted Service Path CVSS 4.0HIGH 8.5
Sources
- CVE-2021-47890 · CVE Program
- CVE-2021-47890 · NVD
- FIRST EPSS
- GHSA-6xfm-hcmf-ch35 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences