CVE-2026-3809
Received Received - Intake
Remote Stack-Based Buffer Overflow in Tenda FH1202 NatStaticSetting

Publication date: 2026-03-09

Last updated on: 2026-03-09

Assigner: VulDB

Description
A flaw has been found in Tenda FH1202 1.2.0.14(408). The impacted element is the function fromNatStaticSetting of the file /goform/NatSaticSetting. Executing a manipulation of the argument page can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been published and may be used.
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Meta Information
Published
2026-03-09
Last Modified
2026-03-09
Generated
2026-06-16
AI Q&A
2026-03-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3809
EUVD
EUVD-2026-10304
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda fh1202_firmware 1.2.0.14(408)
Helpful Resources
Exploitability
CWE
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KEV
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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).
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Executive Summary

[{'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]

Impact Analysis

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.

Compliance Impact

I don't know

Detection Guidance

[{'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]

Mitigation Strategies

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.

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