CVE-2025-15430: UTT 进取 512W Buffer Overflow Vulnerability

CVE-2025-15430 Overview

A buffer overflow vulnerability has been identified in the UTT 进取 512W router firmware version 1.7.7-171114. The vulnerability exists in the strcpy function within the file /goform/formFtpServerShareDirSelcet, where improper handling of the oldfilename argument can lead to a buffer overflow condition. This flaw allows remote attackers to potentially execute arbitrary code or cause denial of service by sending specially crafted requests to the affected endpoint.

Critical Impact

Remote attackers can exploit this buffer overflow vulnerability to compromise network routers, potentially gaining unauthorized access to network infrastructure and intercepting or manipulating network traffic.

Affected Products

• UTT 进取 512W Router Firmware version 1.7.7-171114

Discovery Timeline

• 2026-01-02 - CVE-2025-15430 published to NVD
• 2026-01-02 - Last updated in NVD database

Technical Details for CVE-2025-15430

Vulnerability Analysis

This vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). The flaw originates from the unsafe use of the strcpy function in the FTP server share directory selection functionality of the router's web management interface. When processing user-supplied input through the oldfilename parameter, the application fails to properly validate the length of the input before copying it into a fixed-size buffer.

The network-accessible nature of this vulnerability significantly increases its exploitability, as attackers can reach the vulnerable endpoint remotely without requiring physical access to the device. Authentication is required to exploit this vulnerability, but authenticated users can leverage this flaw to execute arbitrary code with elevated privileges on the affected device.

The vendor was contacted regarding this vulnerability but did not respond, leaving affected devices without an official patch.

Root Cause

The root cause of this vulnerability lies in the use of the unsafe strcpy function without proper bounds checking. The strcpy function copies the source string to the destination buffer without verifying that the destination has sufficient space to hold the data. When the oldfilename parameter contains a string longer than the allocated buffer size, it overwrites adjacent memory regions, corrupting the stack and potentially allowing control flow hijacking.

Attack Vector

The attack is executed remotely over the network by sending a malicious HTTP request to the /goform/formFtpServerShareDirSelcet endpoint. An authenticated attacker crafts a request with an oversized oldfilename parameter value designed to overflow the target buffer. By carefully constructing the payload, an attacker can overwrite the return address on the stack and redirect execution to attacker-controlled code or shellcode.

The exploit for this vulnerability has been made publicly available, increasing the risk of exploitation in the wild. Technical details and proof-of-concept information can be found in the GitHub CVE Details repository and the VulDB entry #339352.

Detection Methods for CVE-2025-15430

Indicators of Compromise

• Unusual HTTP POST requests to /goform/formFtpServerShareDirSelcet with abnormally large oldfilename parameter values
• Router crashes or unexpected reboots following web management interface access
• Anomalous outbound network connections originating from the router device
• Modifications to router configuration or firmware without administrator action

Detection Strategies

• Implement network intrusion detection rules to monitor for HTTP requests containing oversized parameters targeting the /goform/formFtpServerShareDirSelcet endpoint
• Deploy web application firewall (WAF) rules to block requests with oldfilename parameters exceeding expected length thresholds
• Monitor router logs for repeated authentication attempts followed by crashes or service restarts
• Utilize SentinelOne Singularity to detect anomalous behavior patterns associated with buffer overflow exploitation attempts

Monitoring Recommendations

• Enable verbose logging on UTT routers to capture detailed request information for forensic analysis
• Configure network monitoring solutions to alert on traffic patterns consistent with buffer overflow exploitation
• Implement regular integrity checks on router firmware and configuration files to detect unauthorized modifications

How to Mitigate CVE-2025-15430

Immediate Actions Required

• Restrict access to the router's web management interface to trusted networks only using firewall rules or access control lists
• Disable the FTP server share directory feature if not required for business operations
• Implement network segmentation to isolate vulnerable devices from critical network infrastructure
• Consider replacing affected UTT routers with alternative devices from vendors with active security support

Patch Information

No official patch is currently available from the vendor. The vendor was contacted regarding this vulnerability but did not respond. Organizations using affected UTT 进取 512W routers should implement compensating controls until a patch becomes available or consider migrating to supported hardware alternatives.

Additional technical details are available through VulDB #339352 and the GitHub PoC repository.

Workarounds

• Configure firewall rules to restrict access to the web management interface (/goform/* endpoints) to trusted administrative IP addresses only
• Deploy a reverse proxy with input validation to filter oversized parameters before they reach the router
• Implement VLAN segmentation to isolate management interfaces from general network traffic
• Monitor network traffic for exploitation attempts using intrusion detection systems with custom signatures

# Example firewall rule to restrict management interface access (iptables)
# Replace 192.168.1.0/24 with your trusted admin network
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP