Tenda HG3 2.0 Router Vulnerability: Remote Stack Buffer Overflow
The National Vulnerability Database has identified CVE-2026-7151, a critical stack-based buffer overflow vulnerability in Tenda HG3 2.0 routers. Specifically, the formUploadConfig function within the /boaform/formIPv6Routing file is susceptible to manipulation of the destNet argument, leading to remote code execution possibilities.
This isn’t a theoretical issue; an exploit for CVE-2026-7151 has been publicly disclosed, meaning attackers can leverage it now. With a CVSS score of 8.8 (HIGH), this vulnerability presents a significant risk, allowing unauthenticated remote attackers to achieve high impact on confidentiality, integrity, and availability. The widespread use of Tenda routers in home and small office environments means a large attack surface for threat actors.
Attackers will likely target unpatched devices via automated scans, exploiting the known public vulnerability. The low complexity of the attack and the remote vector make this an attractive target for botnet operators or those looking to establish persistent access within networks. Defenders must prioritize patching or isolating these devices immediately.
What This Means For You
- If your organization or home network utilizes Tenda HG3 2.0 routers, you are directly exposed to a critical, publicly exploited vulnerability. Prioritize immediately patching these devices or, if a patch isn't available, isolating them from public internet access. Assume compromise and audit network traffic for unusual activity originating from or targeting these routers.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-7151 Tenda HG3 2.0 Remote Stack Buffer Overflow via formUploadConfig
title: CVE-2026-7151 Tenda HG3 2.0 Remote Stack Buffer Overflow via formUploadConfig
id: scw-2026-04-27-ai-1
status: experimental
level: critical
description: |
This rule detects attempts to exploit the CVE-2026-7151 vulnerability in Tenda HG3 2.0 routers. The vulnerability lies in the formUploadConfig function within the file /boaform/formIPv6Routing, where a stack-based buffer overflow can be triggered by manipulating the 'destNet' argument. This rule specifically looks for file access events related to this file and path, indicating a potential exploit attempt targeting this known vulnerability. The inclusion of various file access types (read, write, delete, execute) broadens the detection scope for different exploit methodologies.
author: SCW Feed Engine (AI-generated)
date: 2026-04-27
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7151/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
TargetFilename|contains:
- '/boaform/formIPv6Routing'
EventType:
- 'FILE_ACCESS_WRITE'
- 'FILE_ACCESS_READ'
- 'FILE_ACCESS_DELETE'
- 'FILE_ACCESS_EXECUTE'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7151 | Buffer Overflow | Tenda HG3 2.0 |
| CVE-2026-7151 | Buffer Overflow | CWE-121: Stack-based Buffer Overflow |
| CVE-2026-7151 | Buffer Overflow | Vulnerable function: formUploadConfig in /boaform/formIPv6Routing |
| CVE-2026-7151 | Buffer Overflow | Vulnerable argument: destNet |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 23:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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