Tenda F456 Router Buffer Overflow (CVE-2026-7079) Exposes Networks
The National Vulnerability Database (NVD) has disclosed CVE-2026-7079, a high-severity buffer overflow vulnerability impacting Tenda F456 router firmware version 1.0.0.5. This flaw resides within the fromAdvSetWan function in the /goform/AdvSetWan component of the router’s httpd service. Specifically, manipulating the wanmode argument can trigger the buffer overflow.
Rated with a CVSS score of 8.8 (High), this vulnerability allows for remote exploitation, meaning attackers don’t need local network access to trigger it. The NVD notes that public exploit code is available, significantly increasing the immediate risk. This is not a theoretical flaw; it’s actively weaponizable and ripe for inclusion in attacker toolkits.
For defenders, the implications are severe. Exploitation could lead to arbitrary code execution, allowing attackers to gain full control of the router. This provides a pivotal beachhead into the internal network, enabling further lateral movement, data exfiltration, or the establishment of persistent access. Given the widespread use of consumer-grade routers in small businesses and home offices, this vulnerability presents a critical attack vector for initial access.
What This Means For You
- If your organization or remote workforce uses Tenda F456 1.0.0.5 routers, assume they are vulnerable to remote compromise. Immediately identify and isolate these devices. There is no patch available yet, so the only viable defense is to remove them from service or place them behind a robust firewall with strict ingress filtering.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 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.
Tenda F456 Router Buffer Overflow - CVE-2026-7079
title: Tenda F456 Router Buffer Overflow - CVE-2026-7079
id: scw-2026-04-27-ai-1
status: experimental
level: critical
description: |
Detects the specific URI path and query parameter used in the Tenda F456 router buffer overflow vulnerability (CVE-2026-7079). The vulnerability is triggered by manipulating the 'wanmode' argument within the /goform/AdvSetWan endpoint, leading to a buffer overflow.
author: SCW Feed Engine (AI-generated)
date: 2026-04-27
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7079/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/goform/AdvSetWan'
cs-method|exact:
- 'POST'
cs-uri-query|contains:
- 'wanmode='
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7079 | Buffer Overflow | Tenda F456 version 1.0.0.5 |
| CVE-2026-7079 | Buffer Overflow | Vulnerable component: httpd |
| CVE-2026-7079 | Buffer Overflow | Vulnerable file: /goform/AdvSetWan |
| CVE-2026-7079 | Buffer Overflow | Vulnerable function: fromAdvSetWan |
| CVE-2026-7079 | Buffer Overflow | Vulnerable argument: wanmode |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 06:15 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.
Believe this infringes your rights? Submit a takedown request.
Related coverage
CVE-2026-7085 — The Function Z.Url Of The File Src/Routes/Setting/About/Down Path Traversal
CVE-2026-7085 — A vulnerability was determined in HBAI-Ltd Toonflow-app up to 1.1.1. This vulnerability affects the function z.url of the file src/routes/setting/about/downloadApp.ts of the component...
CVE-2026-7084 — HBAI-Ltd Toonflow-App Server-Side Request Forgery
CVE-2026-7084 — A vulnerability was found in HBAI-Ltd Toonflow-app up to 1.1.1. This affects the function fetch of the file src/routes/setting/vendorConfig/getCodeByLink.ts of the component getCodeByLink...
CVE-2026-7083 — Likeadmin-Likeshop Likeadmin_php SQL Injection
CVE-2026-7083 — A vulnerability has been found in likeadmin-likeshop likeadmin_php up to 1.9.6. Affected by this issue is the function queryResult of the file server\app\adminapi\lists\tools\DataTableLists.php...