Tenda A21 1.0.0.0 /goform/openSchedWifi setSchedWifi schedStartTime/schedEndTime stack-based overflow
Summary
A vulnerability categorized as critical has been discovered in Tenda A21 1.0.0.0. Impacted is the function setSchedWifi of the file /goform/openSchedWifi. Executing a manipulation of the argument schedStartTime/schedEndTime can lead to stack-based overflow.
This vulnerability is registered as CVE-2026-2873. 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. It has been declared as critical. This vulnerability affects the function setSchedWifi of the file /goform/openSchedWifi. The manipulation of the argument schedStartTime/schedEndTime 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.
The advisory is available at github.com. This vulnerability was named CVE-2026-2873. The exploitation appears to be easy. The attack can be initiated 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.
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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-2026-2873 (🔒)
GCVE (CVE): GCVE-0-2026-2873
GCVE (VulDB): GCVE-100-347110
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 02/20/2026 03:46 PMUpdated: 02/22/2026 11:20 PM
Changes: 02/20/2026 03:46 PM (57), 02/22/2026 11:20 PM (31)
Complete: 🔍
Submitter: hhsw34
Cache ID: 244::40
Submit
Accepted
- Submit #754635: Tenda A21 V1.0.0.0 Stack-based Buffer Overflow (by hhsw34)
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