CVE-2026-3379: Tenda F453 Buffer Overflow Vulnerability

CVE-2026-3379 Overview

A buffer overflow vulnerability has been discovered in the Tenda F453 wireless router firmware version 1.0.0.3. This vulnerability affects the fromSetIpBind function located in the /goform/SetIpBind endpoint. The manipulation of the page argument leads to a buffer overflow condition that can be exploited remotely. The exploit has been disclosed publicly and may be actively used by threat actors targeting vulnerable network infrastructure.

Critical Impact

Remote attackers can exploit this buffer overflow to potentially achieve code execution on vulnerable Tenda F453 routers, compromising network security and enabling further lateral movement within affected networks.

Affected Products

• Tenda F453 Firmware version 1.0.0.3
• Tenda F453 Hardware

Discovery Timeline

• 2026-03-01 - CVE-2026-3379 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2026-3379

Vulnerability Analysis

This vulnerability represents a classic buffer overflow condition (CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer) in embedded network device firmware. The fromSetIpBind function within the Tenda F453 router's web management interface fails to properly validate the length of user-supplied input in the page parameter before copying it to a fixed-size buffer. This lack of bounds checking allows attackers to write beyond allocated memory boundaries, potentially corrupting adjacent memory structures, overwriting return addresses, or hijacking program control flow.

The vulnerability is particularly concerning as it exists in the router's web-based administration interface, which is commonly accessible over the network. Embedded devices like routers often lack modern exploit mitigations such as ASLR (Address Space Layout Randomization) or stack canaries, making successful exploitation more straightforward for attackers.

Root Cause

The root cause is improper input validation in the fromSetIpBind function when processing the page argument from HTTP requests to /goform/SetIpBind. The function fails to verify that the input length does not exceed the destination buffer's capacity, allowing user-controlled data to overflow the allocated memory region.

Attack Vector

The attack can be initiated remotely over the network by sending a specially crafted HTTP request to the /goform/SetIpBind endpoint with an oversized page parameter. No user interaction is required, though low-level authentication may be necessary to access the vulnerable functionality.

The exploitation process involves:

1. Identifying a vulnerable Tenda F453 router running firmware version 1.0.0.3
2. Crafting an HTTP request to /goform/SetIpBind with a malicious page parameter containing excessive data
3. The oversized input overflows the buffer, potentially overwriting critical memory structures
4. Depending on exploitation sophistication, attackers may achieve denial of service or arbitrary code execution

For detailed technical analysis and proof-of-concept information, refer to the GitHub Vulnerability Documentation.

Detection Methods for CVE-2026-3379

Indicators of Compromise

• Unusual HTTP POST requests to /goform/SetIpBind with abnormally large page parameter values
• Router crashes, unexpected reboots, or unstable behavior following web interface access
• Anomalous network traffic originating from the router's management interface
• Evidence of unauthorized configuration changes on affected devices

Detection Strategies

• Implement network intrusion detection rules to monitor for oversized HTTP parameters targeting /goform/SetIpBind
• Deploy web application firewall (WAF) rules to inspect and limit parameter sizes in requests to Tenda router management interfaces
• Enable logging on network segments containing vulnerable devices to capture exploitation attempts
• Conduct regular firmware version audits to identify devices running vulnerable version 1.0.0.3

Monitoring Recommendations

• Monitor HTTP traffic to router management interfaces for anomalous request patterns
• Set up alerts for router stability issues such as unexpected reboots or service interruptions
• Review access logs for the web management interface to identify unauthorized access attempts
• Implement network segmentation monitoring to detect potential lateral movement following device compromise

How to Mitigate CVE-2026-3379

Immediate Actions Required

• Restrict network access to the router's web management interface to trusted IP addresses only
• Disable remote management if not required for operational purposes
• Implement network segmentation to isolate vulnerable devices from critical infrastructure
• Monitor affected devices for signs of exploitation until patches are available

Patch Information

At the time of publication, no official patch has been released by Tenda for this vulnerability. Organizations should monitor the Tenda Official Website for firmware updates addressing CVE-2026-3379. Additional vulnerability details are available through VulDB #348264.

Workarounds

• Restrict administrative interface access to localhost or specific trusted management networks using firewall rules
• Disable the web management interface if device configuration can be performed through alternative methods
• Place vulnerable routers behind an additional firewall or security gateway that can filter malicious requests
• Consider replacing affected devices with alternative hardware if patches remain unavailable

# Example: Restrict management interface access via upstream firewall
# Block external access to Tenda router management ports
iptables -A FORWARD -d <ROUTER_IP> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <ROUTER_IP> -p tcp --dport 443 -j DROP

# Allow management access only from trusted admin network
iptables -I FORWARD -s <ADMIN_NETWORK>/24 -d <ROUTER_IP> -p tcp --dport 80 -j ACCEPT