Tenda F456 Router Vulnerability (CVE-2026-7099) Exposes Networks
A critical buffer overflow vulnerability, identified as CVE-2026-7099, has been reported in the Tenda F456 router, specifically version 1.0.0.5. The National Vulnerability Database (NVD) indicates this flaw resides within the formQuickIndex function of the /goform/QuickIndex file, part of the httpd component. Remote manipulation of the mit_linktype argument triggers the overflow.
This vulnerability carries a CVSSv3.1 score of 8.8 (HIGH), reflecting its severe impact. Attackers can exploit this remotely with low privileges, leading to high confidentiality, integrity, and availability impacts. The National Vulnerability Database confirms that a public exploit is available, meaning this isn’t theoretical – it’s actively weaponized.
For defenders, this is a clear and present danger. Tenda F456 routers are common in small office/home office (SOHO) environments. Their widespread deployment, coupled with the ease of remote exploitation and public exploit availability, makes them prime targets. Attackers are looking for the lowest hanging fruit; unpatched SOHO routers are often it. This isn’t just about the router itself; it’s about the network segment it protects and the access it grants into the wider corporate or personal network.
What This Means For You
- If your organization or remote workforce uses Tenda F456 1.0.0.5 routers, you need to immediately assess your exposure. Public exploits mean attackers are already scanning for these devices. Isolate or replace these devices if a patch isn't available. Do not leave them exposed to the internet.
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 QuickIndex Buffer Overflow Attempt (CVE-2026-7099)
title: Tenda F456 Router QuickIndex Buffer Overflow Attempt (CVE-2026-7099)
id: scw-2026-04-27-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-7099 by targeting the formQuickIndex function in the Tenda F456 router. This rule looks for POST requests to the /goform/QuickIndex endpoint with the 'mit_linktype' parameter, which is indicative of a buffer overflow attempt.
author: SCW Feed Engine (AI-generated)
date: 2026-04-27
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7099/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/goform/QuickIndex'
cs-uri-query|contains:
- 'mit_linktype='
cs-method:
- 'POST'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7099 | Buffer Overflow | Tenda F456 version 1.0.0.5 |
| CVE-2026-7099 | Buffer Overflow | Vulnerable function: formQuickIndex in /goform/QuickIndex |
| CVE-2026-7099 | Buffer Overflow | Vulnerable component: httpd |
| CVE-2026-7099 | Buffer Overflow | Manipulation of argument: mit_linktype |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 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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