CVE-2026-3809
Remote Stack-Based Buffer Overflow in Tenda FH1202 NatStaticSetting
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
Can you explain this vulnerability to me?
[{'type': 'paragraph', 'content': 'CVE-2026-3809 is a critical stack-based buffer overflow vulnerability found in the Tenda FH1202 router, version 1.2.0.14(408). The flaw exists in the function fromNatStaticSetting within the file /goform/NatSaticSetting. It arises from improper handling of the "page" argument, which is passed to the sprintf function without bounds checking, leading to a stack overflow condition.'}, {'type': 'paragraph', 'content': 'This vulnerability allows remote attackers to exploit the flaw by sending a crafted HTTP POST request with an excessively long "page" parameter, causing the overflow.'}, {'type': 'paragraph', 'content': 'The overflow can lead to denial of service or potentially allow arbitrary remote code execution on the device.'}] [1, 2, 3]
How can this vulnerability impact me? :
Exploiting this vulnerability can impact the affected router by causing a denial of service (DoS), making the device unavailable.
More severely, it may allow an attacker to execute arbitrary code remotely, compromising the router’s confidentiality, integrity, and availability.
Since the attack can be launched remotely without local access or physical interaction, it poses a significant security risk.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
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 crafted HTTP POST request to the endpoint /goform/NatSaticSetting with an excessively long "page" parameter. Monitoring network traffic for such suspicious POST requests targeting this endpoint may help identify exploitation attempts.'}, {'type': 'paragraph', 'content': 'A detection command example using curl to test the vulnerability could be:'}, {'type': 'list_item', 'content': 'curl -X POST http://[router_ip]/goform/NatSaticSetting -d "page=$(python3 -c \'print("A"*1000)\')"'}, {'type': 'paragraph', 'content': 'This command sends a POST request with a very long "page" parameter, which may trigger the buffer overflow if the device is vulnerable.'}] [2, 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 device with an alternative product to avoid exploitation.