CVE-2026-5045

Received Received - Intake

Remote Stack-Based Buffer Overflow in Tenda FH1201 Parameter Handler

Publication date: 2026-03-29

Last updated on: 2026-03-30

Assigner: VulDB

Description

A vulnerability was detected in Tenda FH1201 1.2.0.14(408). This impacts the function WrlclientSet of the file /goform/WrlclientSet of the component Parameter Handler. Performing a manipulation of the argument GO results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-03-29

Last Modified

2026-03-30

Generated

2026-07-06

AI Q&A

2026-03-29

EPSS Evaluated

2026-07-04

NVD

CVE-2026-5045

EUVD

EUVD-2026-17031

Affected Vendors & Products

Vendor	Product	Version / Range
tenda	fh1201_firmware	1.2.0.14(408)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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).
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.

Attack-Flow Graph

Executive Summary

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.

Impact Analysis

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.

Detection Guidance

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.

Mitigation Strategies

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.

Compliance Impact

The provided information does not specify how the CVE-2026-5045 vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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