Lucky LM-520-SC/LM-520-FSC/LM-520-FSC-SAM up to 20250321 missing authentication
Summary
A vulnerability identified as problematic has been detected in Lucky LM-520-SC, LM-520-FSC and LM-520-FSC-SAM up to 20250321. Impacted is an unknown function. This manipulation causes missing authentication. This vulnerability is registered as CVE-2025-5876. Remote exploitation of the attack is possible. Furthermore, an exploit is available. It is advisable to implement restrictive firewalling. The vendor was contacted early about this disclosure but did not respond in any way.
Details
A vulnerability classified as problematic was found in Lucky LM-520-SC, LM-520-FSC and LM-520-FSC-SAM up to 20250321. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a missing authentication vulnerability. The CWE definition for the vulnerability is CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. As an impact it is known to affect confidentiality.
It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-5876. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available.
It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.
Proper firewalling of is able to address this issue.
The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-17459). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Product
Vendor
Name
Version
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.3VulDB Meta Temp Score: 4.7
VulDB Base Score: 5.3
VulDB Temp Score: 4.7
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Missing authenticationCWE: CWE-306 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: FirewallStatus: 🔍
0-Day Time: 🔒
Timeline
06/08/2025 Advisory disclosed06/08/2025 VulDB entry created
06/09/2025 VulDB entry last update
Sources
Advisory: github.comStatus: Not defined
CVE: CVE-2025-5876 (🔒)
GCVE (CVE): GCVE-0-2025-5876
GCVE (VulDB): GCVE-100-311635
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 06/08/2025 20:06Updated: 06/09/2025 16:03
Changes: 06/08/2025 20:06 (55), 06/09/2025 16:03 (1)
Complete: 🔍
Submitter: zeke
Cache ID: 216::103
Submit
Accepted
- Submit #585821: Lucky Technology Ltd LM-520-SC 5.0.9433A Missing Authentication for Critical Function (by zeke)
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
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