Tenda F456 Buffer Overflow (CVE-2026-7082) Allows Remote Attack
The National Vulnerability Database has detailed CVE-2026-7082, a high-severity buffer overflow vulnerability impacting Tenda F456 routers, specifically version 1.0.0.5. The flaw resides in the formWrlExtraSet function within the /goform/WrlExtraSet component of the httpd service. An attacker can trigger this vulnerability by manipulating the Go argument, leading to a buffer overflow.
This is not a theoretical threat. The attack can be executed remotely, and an exploit has already been published. With a CVSSv3.1 score of 8.8, this vulnerability presents a critical risk, allowing for high impact on confidentiality, integrity, and availability. The ease of exploitation, coupled with remote access, makes this a prime target for opportunistic attackers looking to compromise network edge devices.
CISOs and network defenders must understand that exposed SOHO and consumer-grade routers like the Tenda F456 are often overlooked, yet they provide a direct pathway into a network. Once compromised, these devices can serve as persistent footholds, enabling further lateral movement, data exfiltration, or the establishment of botnet nodes. This is a clear indicator that perimeter security extends beyond enterprise-grade firewalls.
What This Means For You
- If your organization or remote workers utilize Tenda F456 routers, specifically version 1.0.0.5, you are exposed. The exploit is public, meaning active attacks are highly probable. Immediately identify and isolate these devices. If a patch is unavailable, replace them or implement strict network segmentation and access controls to mitigate risk.
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.
CVE-2026-7082 Tenda F456 Buffer Overflow via formWrlExtraSet
title: CVE-2026-7082 Tenda F456 Buffer Overflow via formWrlExtraSet
id: scw-2026-04-27-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-7082 by sending a POST request to the /goform/WrlExtraSet endpoint with a manipulated 'Go' parameter, which triggers a buffer overflow vulnerability in the Tenda F456 firmware.
author: SCW Feed Engine (AI-generated)
date: 2026-04-27
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7082/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/goform/WrlExtraSet'
cs-uri-query|contains:
- 'Go='
cs-method|exact:
- 'POST'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7082 | Buffer Overflow | Tenda F456 version 1.0.0.5 |
| CVE-2026-7082 | Buffer Overflow | Vulnerable function: formWrlExtraSet |
| CVE-2026-7082 | Buffer Overflow | Vulnerable file: /goform/WrlExtraSet |
| CVE-2026-7082 | Buffer Overflow | Vulnerable component: httpd |
| CVE-2026-7082 | Buffer Overflow | Manipulation of argument: Go |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 07:16 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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