Tenda HG9 300001138 Loopback Detection Configuration Endpoint /boaform/formLoopBack Ethtype stack-based overflow
Summary
A vulnerability has been found in Tenda HG9 300001138 and classified as critical. This affects an unknown part of the file /boaform/formLoopBack of the component Loopback Detection Configuration Endpoint. Performing a manipulation of the argument Ethtype results in stack-based overflow. This vulnerability is reported as CVE-2026-2908. The attack is possible to be carried out remotely. Moreover, an exploit is present.
Details
A vulnerability was found in Tenda HG9 300001138. It has been classified as critical. This affects an unknown part of the file /boaform/formLoopBack of the component Loopback Detection Configuration Endpoint. The manipulation of the argument Ethtype with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability.
The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-2908. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details and a public exploit are known.
The exploit is shared for download at github.com. It is declared as proof-of-concept.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Product
Type
Vendor
Name
Version
License
Website
- Vendor: https://www.tenda.com.cn/
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: 8.8VulDB Meta Temp Score: 8.4
VulDB Base Score: 8.8
VulDB Temp Score: 8.0
VulDB Vector: 🔒
VulDB Reliability: 🔍
CNA Base Score: 8.8
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: Stack-based overflowCWE: CWE-121 / CWE-119
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
02/20/2026 Advisory disclosed02/20/2026 VulDB entry created
02/23/2026 VulDB entry last update
Sources
Vendor: tenda.com.cnAdvisory: github.com
Status: Not defined
CVE: CVE-2026-2908 (🔒)
GCVE (CVE): GCVE-0-2026-2908
GCVE (VulDB): GCVE-100-347217
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 02/20/2026 21:20Updated: 02/23/2026 03:22
Changes: 02/20/2026 21:20 (57), 02/23/2026 03:22 (31)
Complete: 🔍
Submitter: LINXI666
Cache ID: 216::103
Submit
Accepted
- Submit #755202: Tenda HG9 V300001138 Stack-based Buffer Overflow (by LINXI666)
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
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