CVE-2026-15694: Tenda BE12 Pro Buffer Overflow Vulnerability

CVE-2026-15694 Overview

CVE-2026-15694 is a stack-based buffer overflow vulnerability in the Tenda BE12 Pro router running firmware version 16.03.66.23. The flaw resides in the fromSetIpBind function of the /goform/SetIpBind endpoint, where the page argument is not properly validated before being copied onto a fixed-size stack buffer. Attackers can trigger the overflow remotely over the network, and a public exploit is already available. The weakness is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer).

Critical Impact
Remote attackers with low-privileged access can corrupt stack memory on the affected router, potentially leading to arbitrary code execution or full device compromise.

Affected Products

Tenda BE12 Pro router
Firmware version 16.03.66.23
/goform/SetIpBind web management endpoint

Discovery Timeline

2026-07-14 - CVE-2026-15694 published to NVD
2026-07-14 - Last updated in NVD database

Technical Details for CVE-2026-15694

Vulnerability Analysis

The vulnerability exists in the fromSetIpBind handler exposed through the router's web management interface at /goform/SetIpBind. When the handler processes an HTTP request, it reads the page parameter supplied by the client and copies it into a fixed-size buffer on the stack without enforcing length checks. Supplying an oversized page value overwrites adjacent stack memory, including saved registers and the return address. The condition is reachable remotely across the network and requires only low-privileged access to the management interface. A working proof-of-concept has been published in a GitHub Issue Discussion, and additional analysis is available on VulDB Vulnerability Details.

Root Cause

The root cause is missing input length validation on the page argument inside fromSetIpBind. The function relies on unchecked string operations to move attacker-controlled data into a stack buffer, which is the classic pattern behind [CWE-119] memory corruption on embedded MIPS/ARM router firmware.

Attack Vector

An attacker sends a crafted HTTP POST request to /goform/SetIpBind with an oversized page parameter. If the management interface is exposed to the LAN or, worse, to the WAN, the attacker can trigger the overflow without local access. Successful exploitation can hijack execution flow to run attacker-supplied shellcode, disrupt device operation, or pivot into the internal network.

No verified exploit code is reproduced here. Refer to the VulDB CVE-2026-15694 entry for technical details.

Detection Methods for CVE-2026-15694

Indicators of Compromise

HTTP POST requests to /goform/SetIpBind containing unusually long page parameter values.
Unexpected reboots, crashes, or httpd process restarts on Tenda BE12 Pro devices.
Outbound connections from the router to unknown hosts following administrative interface access.

Detection Strategies

Inspect web traffic destined for router management interfaces and flag requests where page exceeds expected length bounds.
Correlate authentication events on the router with subsequent malformed /goform/* requests to surface post-login exploitation attempts.
Deploy IDS/IPS signatures that match oversized POST bodies targeting the fromSetIpBind endpoint.

Monitoring Recommendations

Forward router syslog and administrative access logs to a centralized log platform for retention and search.
Alert on repeated 5xx responses or connection resets from the router web server, which often accompany overflow attempts.
Baseline normal management traffic patterns and alert on requests originating from unexpected source addresses.

How to Mitigate CVE-2026-15694

Immediate Actions Required

Restrict access to the Tenda BE12 Pro web management interface to trusted management VLANs only.
Disable remote WAN-side administration if it is currently enabled on affected devices.
Rotate administrator credentials and audit accounts with access to the router.
Monitor the Tenda Official Website for a firmware update addressing this issue.

Patch Information

At the time of publication, no vendor patch has been referenced in the NVD entry for firmware 16.03.66.23. Track the VulDB CVE-2026-15694 advisory and the vendor's support portal for firmware updates that address the fromSetIpBind overflow.

Workarounds

Place the router management interface behind a firewall rule that only permits connections from a dedicated administrative host.
Segment IoT and network infrastructure devices onto isolated VLANs to limit blast radius if a router is compromised.
Replace vulnerable devices in high-risk environments until an official firmware fix is released.

bash

# Example: restrict router admin access to a single management host using iptables upstream
iptables -A FORWARD -p tcp -d <router_ip> --dport 80  -s <admin_host> -j ACCEPT
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -s <admin_host> -j ACCEPT
iptables -A FORWARD -p tcp -d <router_ip> --dport 80  -j DROP
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -j DROP