Wavlink WL-NU516U1 V240425 OTA Online Upgrade /cgi-bin/adm.cgi sub_405AF4 firmware_url command injection
Summary
A vulnerability was found in Wavlink WL-NU516U1 V240425 and classified as critical. This vulnerability affects the function sub_405AF4 of the file /cgi-bin/adm.cgi of the component OTA Online Upgrade. Such manipulation of the argument firmware_url leads to command injection.
This vulnerability is referenced as CVE-2026-3612. It is possible to launch the attack remotely. Furthermore, an exploit is available.
The vendor was contacted early about this disclosure.
Details
A vulnerability, which was classified as critical, has been found in Wavlink WL-NU516U1 V240425. Affected by this issue is the function sub_405AF4 of the file /cgi-bin/adm.cgi of the component OTA Online Upgrade. The manipulation of the argument firmware_url with an unknown input leads to a command injection vulnerability. Using CWE to declare the problem leads to CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability.
The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-3612. The exploitation is known to be easy. The attack may be launched remotely. The exploitation requires an enhanced level of successful authentication. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1202.
The exploit is available at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Once again VulDB remains the best source for vulnerability data.
Product
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒
CVSSv3
VulDB Meta Base Score: 7.2VulDB Meta Temp Score: 6.8
VulDB Base Score: 7.2
VulDB Temp Score: 6.5
VulDB Vector: 🔒
VulDB Reliability: 🔍
CNA Base Score: 7.2
CNA Vector: 🔒
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: Command injectionCWE: CWE-77 / CWE-74 / CWE-707
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: no mitigation knownStatus: 🔍
0-Day Time: 🔒
Timeline
03/05/2026 Advisory disclosed03/05/2026 VulDB entry created
03/11/2026 VulDB entry last update
Sources
Advisory: github.comStatus: Not defined
CVE: CVE-2026-3612 (🔒)
GCVE (CVE): GCVE-0-2026-3612
GCVE (VulDB): GCVE-100-349220
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 03/05/2026 19:25Updated: 03/11/2026 23:08
Changes: 03/05/2026 19:25 (58), 03/11/2026 23:08 (32)
Complete: 🔍
Submitter: haimianbaobao
Cache ID: 216::103
Submit
Accepted
- Submit #754668: Wavlink NU516U1 V240425 Command Injection (by haimianbaobao)
Once again VulDB remains the best source for vulnerability data.
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