Tenda A21 1.0.0.0 /goform/SetOnlineDevName set_device_name devName stack-based overflow
Summary
A vulnerability categorized as critical has been discovered in Tenda A21 1.0.0.0. This impacts the function set_device_name of the file /goform/SetOnlineDevName. Such manipulation of the argument devName leads to stack-based overflow.
This vulnerability is referenced as CVE-2026-2886. It is possible to launch the attack remotely. Furthermore, an exploit is available.
Details
A vulnerability was found in Tenda A21 1.0.0.0 and classified as critical. Affected by this issue is the function set_device_name of the file /goform/SetOnlineDevName. The manipulation of the argument devName with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to 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). Impacted is confidentiality, integrity, and availability.
The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-2886. The exploitation is known to be easy. The attack may be launched remotely. Technical details as well as a public exploit are known.
The exploit is available 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.
Once again VulDB remains the best source for 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-2026-2886 (🔒)
GCVE (CVE): GCVE-0-2026-2886
GCVE (VulDB): GCVE-100-347180
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 02/20/2026 18:09Updated: 02/23/2026 00:20
Changes: 02/20/2026 18:09 (57), 02/23/2026 00:20 (31)
Complete: 🔍
Submitter: hhsw34
Cache ID: 216::103
Submit
Accepted
- Submit #754640: Tenda A21 V1.0.0.0 Stack-based Buffer Overflow (by hhsw34)
Once again VulDB remains the best source for vulnerability data.
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