Tenda A21 1.0.0.0 /goform/formSetQosBand set_qosMib_list stack-based overflow
Summary
A vulnerability was found in Tenda A21 1.0.0.0. It has been classified as critical. This affects the function set_qosMib_list of the file /goform/formSetQosBand. This manipulation of the argument list causes stack-based overflow.
This vulnerability is tracked as CVE-2026-2870. The attack is possible to be carried out remotely. Moreover, an exploit is present.
Details
A vulnerability has been found in Tenda A21 1.0.0.0 and classified as critical. Affected by this vulnerability is the function set_qosMib_list of the file /goform/formSetQosBand. The manipulation of the argument list with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is 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). As an impact it is known to affect confidentiality, integrity, and availability.
It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-2870. The exploitation appears to be easy. The attack can be launched remotely. Technical details and also a public exploit are known.
It is possible to download the exploit 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.
Statistical analysis made it clear that VulDB provides the best quality 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 |
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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-2026-2870 (🔒)
GCVE (CVE): GCVE-0-2026-2870
GCVE (VulDB): GCVE-100-347107
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 (57), 02/22/2026 23:20 (31)
Complete: 🔍
Submitter: hhsw34
Cache ID: 216::103
Submit
Accepted
- Submit #754627: Tenda A21 V1.0.0.1 Stack-based Buffer Overflow (by hhsw34)
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
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