CVE-2026-4254
Received Received - Intake
Stack-Based Buffer Overflow in Tenda AC8 HTTP Endpoint

Publication date: 2026-03-16

Last updated on: 2026-03-20

Assigner: VulDB

Description
A weakness has been identified in Tenda AC8 up to 16.03.50.11. This vulnerability affects the function doSystemCmd of the file /goform/SysToolChangePwd of the component HTTP Endpoint. This manipulation of the argument local_2c causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.
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Meta Information
Published
2026-03-16
Last Modified
2026-03-20
Generated
2026-06-16
AI Q&A
2026-03-16
EPSS Evaluated
2026-06-15
NVD
EUVD
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda ac8_firmware to 16.03.50.11 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
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

This vulnerability exists in the Tenda AC8 router firmware up to version 16.03.50.11. It affects the function doSystemCmd within the /goform/SysToolChangePwd HTTP endpoint component. The issue is caused by improper handling of the argument local_2c, which leads to a stack-based buffer overflow. This flaw can be exploited remotely, allowing an attacker to execute arbitrary code or cause a denial of service.

Impact Analysis

The vulnerability can be exploited remotely without any authentication, making it highly dangerous. Successful exploitation could allow an attacker to execute arbitrary code on the affected device, potentially taking full control of the router. This could lead to network compromise, interception or manipulation of network traffic, disruption of internet connectivity, or use of the device as part of a botnet.

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Detection Guidance

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