Tenda F456 Router Buffer Overflow (CVE-2026-7055) Exposes Remote Attack
The National Vulnerability Database has disclosed CVE-2026-7055, a high-severity buffer overflow vulnerability impacting the Tenda F456 router, specifically version 1.0.0.5. This flaw resides within the fromVirtualSer function of the /goform/VirtualSer component, part of the device’s httpd service.
Exploiting this vulnerability is straightforward: manipulating the menufacturer/Go argument triggers the buffer overflow. What’s critical here is the attack vector: it’s entirely remote. An attacker doesn’t need physical access or even to be on the local network. With a CVSS score of 8.8, this is a critical issue that allows for significant impact, as indicated by the ‘High’ ratings for confidentiality, integrity, and availability.
The public disclosure of an exploit for CVE-2026-7055 means this isn’t theoretical; it’s an active threat. Defenders must assume this vulnerability is being scanned for and exploited in the wild. Given the pervasiveness of SOHO routers and their common exposure to the internet, this is a prime target for initial access by threat actors.
What This Means For You
- If your organization or remote workforce uses Tenda F456 routers, especially version 1.0.0.5, you need to immediately assess your exposure. These devices are often forgotten at the network edge, making them perfect targets for remote exploitation. Patch or replace affected devices without delay. Assume compromise if these are internet-facing and unpatched.
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-2026-7055
title: Tenda F456 Router Buffer Overflow - CVE-2026-7055
id: scw-2026-04-26-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit the buffer overflow vulnerability (CVE-2026-7055) in Tenda F456 routers by targeting the /goform/VirtualSer endpoint with a POST request. The vulnerability is triggered by manipulating the 'menufacturer' parameter, leading to a buffer overflow. This rule specifically looks for the vulnerable URI path and the presence of the 'menufacturer=Go' parameter within the query string, indicating a potential exploit attempt.
author: SCW Feed Engine (AI-generated)
date: 2026-04-26
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7055/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/goform/VirtualSer'
cs-method|exact:
- 'POST'
cs-uri-query|contains:
- 'menufacturer=Go&'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7055 | Buffer Overflow | Tenda F456 version 1.0.0.5 |
| CVE-2026-7055 | Buffer Overflow | Vulnerable component: httpd |
| CVE-2026-7055 | Buffer Overflow | Vulnerable file: /goform/VirtualSer |
| CVE-2026-7055 | Buffer Overflow | Vulnerable function: fromVirtualSer |
| CVE-2026-7055 | Buffer Overflow | Manipulation of argument: menufacturer/Go |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 01:17 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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