CVE-2026-7029: Tenda F456 Buffer Overflow Exposes Routers to Remote Attacks
The National Vulnerability Database has disclosed CVE-2026-7029, a high-severity buffer overflow vulnerability in the Tenda F456 router, version 1.0.0.5. Specifically, the flaw resides in the fromaddressNat function within the /goform/addressNat file. Attackers can trigger this vulnerability by manipulating the menufacturer/Go argument, leading to a buffer overflow.
This is a remote exploit, meaning an attacker doesn’t need physical access to the device. The National Vulnerability Database reports a CVSS v3.1 score of 8.8 (HIGH), indicating significant risk. Crucially, an exploit for this vulnerability has been made public, lowering the bar for attackers and increasing the likelihood of widespread exploitation. The affected component is core to network address translation, a critical function in network devices.
For defenders, this means any Tenda F456 1.0.0.5 devices on your network, especially those exposed to the internet, are immediately at risk. Buffer overflows often lead to remote code execution, giving attackers full control. Given the public exploit, it’s not a matter of if but when these devices will be targeted. The attacker’s calculus here is simple: target easily exploitable, unpatched network infrastructure to gain a foothold.
What This Means For You
- If your organization uses Tenda F456 1.0.0.5 routers, you need to isolate them or disconnect them from the internet immediately. Patching is the priority, but given the public exploit, assume compromise if these devices have been internet-facing. Audit network logs for unusual activity originating from or targeting these devices. This isn't theoretical; the exploit is out there.
Related ATT&CK Techniques
🛡️ Detection Rules
5 rules · 6 SIEM formats5 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.
Web Application Exploitation Attempt — CVE-2026-7029
title: Web Application Exploitation Attempt — CVE-2026-7029
id: scw-2026-04-26-1
status: experimental
level: high
description: |
Detects common exploitation patterns targeting web applications. Review CVE-2026-7029 advisories for specific indicators.
author: SCW Feed Engine (auto-generated)
date: 2026-04-26
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7029/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- '..'
- 'SELECT'
- 'UNION'
- '<script'
- 'cmd='
- '/etc/passwd'
condition: selection
falsepositives:
- Legitimate activity from CVE-2026-7029
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7029 | Buffer Overflow | Tenda F456 version 1.0.0.5 |
| CVE-2026-7029 | Buffer Overflow | Vulnerable function: fromaddressNat in /goform/addressNat |
| CVE-2026-7029 | Buffer Overflow | Vulnerable argument: menufacturer/Go |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 26, 2026 at 12:16 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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