Tenda A21 1.0.0.0 MAC Filtering Configuration Endpoint /goform/setBlackRule set_device_name devName/mac stack-based overflow
Summary
A vulnerability was found in Tenda A21 1.0.0.0. It has been rated as critical. This issue affects the function set_device_name of the file /goform/setBlackRule of the component MAC Filtering Configuration Endpoint. Performing a manipulation of the argument devName/mac results in stack-based overflow.
This vulnerability is cataloged as CVE-2026-2872. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.
Details
A vulnerability was found in Tenda A21 1.0.0.0. It has been classified as critical. This affects the function set_device_name of the file /goform/setBlackRule of the component MAC Filtering Configuration Endpoint. The manipulation of the argument devName/mac 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-2026-2872. 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.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
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
02/22/2026 VulDB entry last update
Sources
Vendor: tenda.com.cnAdvisory: github.com
Status: Not defined
CVE: CVE-2026-2872 (🔒)
GCVE (CVE): GCVE-0-2026-2872
GCVE (VulDB): GCVE-100-347109
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 02/20/2026 15:46Updated: 02/22/2026 23:20
Changes: 02/20/2026 15:46 (58), 02/22/2026 23:20 (31)
Complete: 🔍
Submitter: hhsw34
Cache ID: 216::103
Submit
Accepted
- Submit #754634: Tenda A21 V1.0.0.0 Stack-based Buffer Overflow (by hhsw34)
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
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