CVE-2026-5045
Remote Stack-Based Buffer Overflow in Tenda FH1201 Parameter Handler
Publication date: 2026-03-29
Last updated on: 2026-03-30
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| tenda | fh1201_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?
CVE-2026-5045 is a stack-based buffer overflow vulnerability found in the Tenda FH1201 router, version 1.2.0.14(408). It occurs in the WrlclientSet function of the HTTP daemon service, which processes a user-supplied parameter named "GO" without validating its length.
Because the parameter is copied into a fixed-size stack buffer using an unsafe function (sprintf) without bounds checking, an attacker can send an excessively long "GO" parameter in a POST request to the /goform/WrlclientSet endpoint to overflow the buffer.
This overflow can lead to denial of service or remote code execution on the device.
How can this vulnerability impact me? :
This vulnerability allows a remote attacker to exploit the Tenda FH1201 router by sending a specially crafted POST request with a large "GO" parameter, causing a stack-based buffer overflow.
The impact includes the possibility of denial of service, which can disrupt network connectivity, or remote code execution, which could allow the attacker to take control of the device.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by sending a specially crafted POST request to the /goform/WrlclientSet endpoint of the Tenda FH1201 router, version 1.2.0.14(408). The request should include an excessively long "GO" parameter to test for a stack-based buffer overflow.
A detection command example using curl would be:
- curl -X POST http://<target-ip>/goform/WrlclientSet -d "GO=$(python3 -c 'print("a"*1000)')"
If the device crashes, becomes unresponsive, or behaves abnormally after this request, it indicates the presence of the vulnerability.
What immediate steps should I take to mitigate this vulnerability?
To mitigate the CVE-2026-5045 vulnerability in the Tenda FH1201 router version 1.2.0.14(408), immediate steps include restricting or blocking remote access to the /goform/WrlclientSet endpoint to prevent exploitation via the vulnerable 'GO' parameter.
Additionally, monitoring network traffic for suspicious POST requests with unusually long 'GO' parameters can help detect exploitation attempts.
If possible, apply any available firmware updates or patches from the vendor that address this buffer overflow vulnerability.
As a temporary measure, consider isolating the affected device from untrusted networks to reduce exposure.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify how the CVE-2026-5045 vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.