CVE-2026-105778
Received Received - Intake

Stack-Based Buffer Overflow in Tenda AC5 Router

Publication date: 2026-10-06

Last updated on: 2026-10-06

Assigner: VulDB

Description
A vulnerability has been found in Tenda AC5 02.03.01.111_multi. Affected by this issue is some unknown functionality of the file /goform/setWifi of the component Wifi Handler. Such manipulation of the argument wifiPwd leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

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Meta Information

Published
2026-10-06
Last Modified
2026-10-06
Generated
2026-10-06
AI Q&A
2026-10-06
EPSS Evaluated
N/A
NVD
CVE-2026-105778
EUVD
EUVD-2026-92987

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Tenda AC5 02.03.01.111_multi

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).

Attack-Flow Graph

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Executive Summary

CVE-2026-105778 is a stack-based buffer overflow in the Tenda AC5 router firmware version V02.03.01.111_multi. The flaw exists in the /goform/setWifi endpoint where the wifiPwd parameter is copied into a fixed-size stack buffer without proper length validation. An attacker can send a POST request with an oversized wifiPwd value (around 500+ bytes) to trigger memory corruption and overwrite the program counter register.

Detection Guidance

To detect this vulnerability, check if your Tenda AC5 router is running firmware version V02.03.01.111_multi. Inspect network traffic for POST requests to /goform/setWifi with unusually large wifiPwd parameters (500+ bytes). Use tools like Wireshark to monitor for malformed requests targeting this endpoint.

Impact Analysis

This vulnerability allows an authenticated attacker with admin privileges to execute arbitrary code remotely. It can lead to complete device compromise, persistent denial-of-service (DoS) requiring factory reset, and potential unauthorized access to network resources. The exploit can also corrupt NVRAM memory, causing the device to fail booting cleanly.

Mitigation Strategies

Immediately update the router firmware to a patched version if available. Disable remote administration to prevent external exploitation. Restrict admin access to trusted networks only. Monitor device logs for suspicious activity related to /goform/setWifi requests. If exploited, perform a factory reset to clear NVRAM corruption.

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