CVE-2026-6199
Received Received - Intake
Remote Stack-Based Buffer Overflow in Tenda F456 QoS Setting

Publication date: 2026-04-13

Last updated on: 2026-04-13

Assigner: VulDB

Description
A vulnerability was found in Tenda F456 1.0.0.5. Impacted is the function fromqossetting of the file /goform/qossetting. The manipulation of the argument page results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made public and could be used.
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Meta Information
Published
2026-04-13
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-04-13
EPSS Evaluated
2026-06-15
NVD
CVE-2026-6199
EUVD
EUVD-2026-22063
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda f456 1.0.0.5
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

CVE-2026-6199 is a stack-based buffer overflow vulnerability found in the Tenda F456 router version 1.0.0.5. It occurs in the HTTP daemon's function called fromqossetting, which processes a user-supplied parameter named "page."

The vulnerability arises because the input from the "page" parameter is passed directly to the sprintf function without any bounds checking, allowing an attacker to overflow the stack buffer by sending an excessively long string.

This overflow can be triggered remotely by sending a specially crafted POST request to the /goform/qossetting endpoint, potentially leading to denial of service or remote code execution on the device.

Impact Analysis

This vulnerability can have serious impacts including denial of service (DoS) and remote code execution (RCE) on the affected Tenda F456 router.

An attacker can exploit this remotely by sending a maliciously crafted request, which could crash the device or allow the attacker to execute arbitrary code, potentially taking control of the router.

Such control could be used to intercept, modify, or disrupt network traffic, compromise network security, or use the device as a foothold for further attacks.

Detection Guidance

This vulnerability can be detected by sending a specially crafted POST request to the /goform/qossetting endpoint of the Tenda F456 router version 1.0.0.5. The request should include an excessively long string in the "page" parameter to test for a stack-based buffer overflow.

A detection command example using curl would be:

  • curl -X POST http://<target-ip>/goform/qossetting -d "page=$(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

Immediate mitigation steps include restricting access to the vulnerable endpoint /goform/qossetting by implementing network-level controls such as firewall rules to block unauthorized or external access.

Additionally, monitor the device for unusual behavior or crashes that may indicate exploitation attempts.

Since the vulnerability arises from improper input validation, applying any available firmware updates or patches from the vendor that address this issue is strongly recommended once they become available.

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