CVE-2025-15461: UTT 进取 520W Buffer Overflow Vulnerability

CVE-2025-15461 Overview

A buffer overflow vulnerability has been discovered in UTT 进取 520W firmware version 1.7.7-180627. This vulnerability affects the strcpy function within the file /goform/formTaskEdit. By manipulating the selDateType argument, an attacker can trigger a buffer overflow condition. The attack can be executed remotely over the network, making this a significant security concern for organizations using affected devices. A proof-of-concept exploit has been published, and the vendor was contacted about this disclosure but did not respond.

Critical Impact

Remote attackers can exploit this buffer overflow vulnerability to potentially achieve code execution, compromise device integrity, and gain unauthorized control over affected UTT 进取 520W routers.

Affected Products

• UTT 进取 520W firmware version 1.7.7-180627

Discovery Timeline

• 2026-01-05 - CVE-2025-15461 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-15461

Vulnerability Analysis

This vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). The flaw exists in the web management interface of the UTT 进取 520W router, specifically in the task editing functionality exposed via the /goform/formTaskEdit endpoint.

The vulnerability stems from unsafe use of the strcpy function when processing the selDateType parameter. When user-controlled input is passed to this parameter without proper bounds checking, the strcpy function copies data into a fixed-size buffer without validating the input length. This allows an attacker to overflow the buffer and potentially overwrite adjacent memory locations.

The network-accessible nature of this vulnerability means that any attacker with network access to the device's web management interface can attempt exploitation without requiring physical access to the device.

Root Cause

The root cause of this vulnerability is the use of the unsafe strcpy function to handle user-supplied input from the selDateType parameter. The strcpy function does not perform any bounds checking, copying data until a null terminator is encountered. When an attacker provides input that exceeds the destination buffer's allocated size, a buffer overflow occurs, potentially corrupting adjacent memory structures, function pointers, or return addresses on the stack.

Attack Vector

The attack vector is network-based, requiring the attacker to send a specially crafted HTTP request to the vulnerable /goform/formTaskEdit endpoint. The attacker must have network access to the device's web management interface. By submitting an oversized or malformed selDateType parameter value, the attacker can trigger the buffer overflow condition.

The attack does not require any user interaction and can be performed by a remote attacker with low-level authentication privileges to the web interface. Successful exploitation could lead to denial of service, arbitrary code execution, or complete device compromise.

Technical details and proof-of-concept information can be found in the GitHub CVE Documentation and the VulDB entry #339497.

Detection Methods for CVE-2025-15461

Indicators of Compromise

• Unusual or malformed HTTP POST requests to /goform/formTaskEdit containing oversized selDateType parameter values
• Device crashes, unexpected reboots, or unresponsive web management interfaces
• Anomalous network traffic patterns to/from UTT router management ports
• Evidence of exploitation attempts in device logs showing abnormally long parameter strings

Detection Strategies

• Implement network intrusion detection rules to monitor for HTTP requests to /goform/formTaskEdit with abnormally large parameter values
• Deploy web application firewall (WAF) rules to block requests with oversized input parameters targeting the affected endpoint
• Configure SentinelOne agents to monitor network traffic patterns indicative of buffer overflow exploitation attempts
• Enable verbose logging on network devices to capture and analyze suspicious request patterns

Monitoring Recommendations

• Monitor UTT 进取 520W devices for unexpected behavior, crashes, or resource consumption anomalies
• Implement continuous network monitoring for traffic to device management interfaces
• Establish baseline behavior patterns and alert on deviations that may indicate exploitation attempts
• Review device logs regularly for evidence of malformed requests or exploitation attempts

How to Mitigate CVE-2025-15461

Immediate Actions Required

• Restrict network access to the device's web management interface using firewall rules or network segmentation
• Limit access to the /goform/formTaskEdit endpoint to trusted IP addresses only
• Consider temporarily disabling the web management interface if not essential for operations
• Monitor for any exploitation attempts while awaiting a vendor patch

Patch Information

At the time of this writing, the vendor (UTT) has not released a security patch for this vulnerability. The vendor was contacted about the disclosure but did not respond. Organizations should monitor for vendor communications regarding security updates and apply patches as soon as they become available. Reference the VulDB submission for tracking updates.

Workarounds

• Implement strict network access controls to limit exposure of the management interface to trusted networks only
• Deploy a reverse proxy with input validation to filter malicious requests before they reach the vulnerable device
• Use VPN connections for remote management instead of exposing the interface directly to untrusted networks
• Consider replacing affected devices with alternatives from vendors with better security response practices if no patch is forthcoming

# Example firewall rule to restrict access to management interface
# Allow only trusted management subnet
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

# Block external access to vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/formTaskEdit" --algo bm -j DROP