CVE-2026-4565
Remote Buffer Overflow in Tenda AC21 formSetQosBand Function
Publication date: 2026-03-23
Last updated on: 2026-04-03
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| tenda | ac21_firmware | 16.03.08.16 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
| CWE-120 | The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
How can this vulnerability impact me? :
Exploiting this buffer overflow vulnerability can allow an attacker to execute arbitrary code on the affected Tenda AC21 router or cause a denial of service, effectively disrupting the normal operation of the device.
Since the attack can be performed remotely, it poses a significant security risk by potentially allowing unauthorized control over the router or causing it to crash, which could interrupt network connectivity.
Can you explain this vulnerability to me?
This vulnerability is a buffer overflow found in the Tenda AC21 router, specifically in the function formSetQosBand within the file /goform/SetNetControlList. By manipulating the argument list passed to this function, an attacker can cause the program to write more data than the allocated buffer can hold, leading to memory corruption.
The vulnerability can be exploited remotely, meaning an attacker does not need physical access to the device to initiate the attack. A proof of concept demonstrating this exploit has been publicly released.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know