CVE-2026-3808
Stack-Based Buffer Overflow in Tenda FH1202 Remote Web Module
Publication date: 2026-03-09
Last updated on: 2026-03-09
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| tenda | fh1202_firmware | 1.2.0.14(408) |
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-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). |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
Can you explain this vulnerability to me?
CVE-2026-3808 is a stack-based buffer overflow vulnerability found in the Tenda FH1202 router running firmware version 1.2.0.14(408). It occurs in the function formWebTypeLibrary within the /goform/webtypelibrary endpoint. The vulnerability arises because the parameter webSiteId is concatenated into a fixed-size stack buffer using the unsafe strcat function without bounds checking. If an attacker supplies an excessively long webSiteId value, it causes a stack overflow.
This overflow can lead to corruption of local variables or function parameters, potentially resulting in denial of service (DoS) or remote code execution (RCE) on the affected device. The attack can be initiated remotely without authentication.
How can this vulnerability impact me? :
Exploitation of this vulnerability can impact the confidentiality, integrity, and availability of the affected Tenda FH1202 router.
- Denial of Service (DoS) - The device can be crashed or rendered unavailable.
- Remote Code Execution (RCE) - An attacker may execute arbitrary code remotely, potentially taking full control of the device.
- No authentication is required to exploit this vulnerability, increasing the risk.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
[{'type': 'paragraph', 'content': 'This vulnerability can be detected by sending a specially crafted POST request to the endpoint /goform/webtypelibrary with an excessively long webSiteId parameter. If the device is vulnerable, this may trigger a stack-based buffer overflow.'}, {'type': 'paragraph', 'content': 'A detection command example is to use curl to send a POST request with a large payload in the webSiteId parameter, such as:'}, {'type': 'list_item', 'content': 'curl -X POST http://<target-ip>/goform/webtypelibrary -d "webSiteId=$(python3 -c \'print("a"*1000)\')"'}, {'type': 'paragraph', 'content': 'If the device crashes, becomes unresponsive, or behaves abnormally after this request, it indicates the presence of the vulnerability.'}] [3]
What immediate steps should I take to mitigate this vulnerability?
No known mitigations or countermeasures have been identified for this vulnerability.
The recommended immediate step is to replace the affected Tenda FH1202 router running firmware version 1.2.0.14(408) with an alternative device that is not vulnerable.