CVE-2026-85109
Received Received - Intake

Buffer Overflow in Tenda HG10 Boa Web Server

Vulnerability report for CVE-2026-85109, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: VulDB

Description

A vulnerability was determined in Tenda HG10 300001138. This issue affects the function formLogin of the file /boaform/formLogin of the component Boa Web Server. Executing a manipulation of the argument Username can lead to buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
tenda hg10 300001138

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output 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.

Attack-Flow Graph

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Executive Summary

This vulnerability is a buffer overflow in the Tenda HG10 router's Boa Web Server. It occurs in the formLogin function when handling the Username parameter. The server copies the input into a fixed-size buffer without checking its length, allowing a remote attacker to send a long string that overflows the buffer. This can crash the device or potentially execute arbitrary code.

Detection Guidance

To detect this vulnerability, check if your Tenda HG10 router is running firmware version HG7_HG9_HG10re_300001138. Send a crafted HTTP POST request to /boaform/formLogin with an excessively long username parameter and observe if the router becomes unresponsive. Tools like curl can be used for testing.

Impact Analysis

If exploited, this vulnerability could allow remote attackers to crash your Tenda HG10 router, disrupting internet access. In severe cases, it might enable arbitrary code execution, potentially giving attackers control over the device. This could lead to network compromise or further attacks within your local network.

Mitigation Strategies

Immediately update the router's firmware to the latest version provided by Tenda. If no update is available, consider replacing the device or disabling remote access to the web interface until a patch is released.

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