CVE-2026-3379:

Overview

A critical security flaw has been identified in the Tenda F453 wireless router, firmware version 1.0.0.3. This vulnerability allows a remote attacker to send specially crafted data to the device’s web management interface, triggering a buffer overflow condition. This type of flaw can enable an attacker to take control of the affected device.

Vulnerability Details

The vulnerability exists within the fromSetIpBind function, which handles requests to the /goform/SetIpBind page on the router. This function does not properly validate or limit the amount of data it receives in the “page” argument. By sending an overly long string of data to this specific interface, an attacker can overflow the memory buffer allocated for it. This can corrupt the router’s normal operation and potentially allow the attacker to execute their own malicious code on the device. The exploit for this vulnerability is publicly available, increasing the risk of active attacks.

Potential Impact

If successfully exploited, this vulnerability can have severe consequences:

• Full Device Compromise: An attacker could gain complete administrative control over the router.
• Network Infiltration: A compromised router can be used to intercept, monitor, or redirect all internet traffic passing through it, potentially capturing sensitive data like login credentials.
• Persistence & Pivoting: The attacker could maintain a hidden presence on the network and launch further attacks against other connected devices, such as computers, phones, or smart home appliances.
• Service Disruption: The attack could cause the router to crash or become unstable, resulting in a denial of service for all connected users.

Remediation and Mitigation

Immediate action is required to protect affected networks.

Primary Solution - Firmware Update:

1. Check for Updates: Log in to your Tenda F453 router’s web administration panel.
2. Navigate to the firmware upgrade section (often found under “System Tools” or “Advanced Settings”).
3. Check for and install any available firmware update provided by Tenda. If version 1.0.0.3 is the latest available, you must apply the following mitigations.

Critical Mitigations (If No Update is Available):

• Disable Remote Management: Ensure the router’s web administration interface is not accessible from the public internet (the WAN side). This setting is typically found under “Remote Management” or “Web Management” in the admin panel and should be disabled.
• Use a Strong Admin Password: Change the router’s default administrative password to a unique, complex passphrase.
• Network Segmentation: If possible, place sensitive devices on a separate network segment or VLAN.
• Monitor for Replacement: Consider replacing the router with a model from a vendor that provides regular and timely security updates.

Important Note: As the exploit is publicly available, relying solely on network perimeter defenses is insufficient. Applying the vendor firmware patch is the only complete solution.