CVE-2025-10171: UTT 1250GW Buffer Overflow Vulnerability

CVE-2025-10171 Overview

CVE-2025-10171 is a buffer overflow vulnerability in the UTT 1250GW router firmware through version 3.2.2-200710. The flaw resides in the sub_453DC function processing requests to the /goform/formConfigApConfTemp endpoint. Remote attackers with low privileges can trigger the overflow over the network to compromise confidentiality, integrity, and availability of the device. A public exploit is available, and the vendor did not respond to disclosure attempts, leaving affected devices without an official patch.

Critical Impact
Remote authenticated attackers can corrupt memory on UTT 1250GW routers through the /goform/formConfigApConfTemp endpoint, enabling potential code execution and full device takeover.

Affected Products

UTT 1250GW Router (hardware)
UTT 1250GW Firmware versions up to and including 3.2.2-200710
Deployments exposing the web management interface to untrusted networks

Discovery Timeline

2025-09-09 - CVE-2025-10171 published to NVD
2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-10171

Vulnerability Analysis

The vulnerability is classified under [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer). It affects the sub_453DC function in the UTT 1250GW firmware, which handles HTTP POST data submitted to the /goform/formConfigApConfTemp web management endpoint. The function fails to enforce bounds on attacker-controlled input before writing it to a fixed-size buffer.

Exploitation requires network reachability to the management interface and low-level authenticated access. Successful exploitation results in stack or heap memory corruption, which can be leveraged to crash the device or execute arbitrary code in the context of the embedded web server. Public exploit code has been released, increasing the likelihood of opportunistic attacks against exposed devices.

Root Cause

The root cause is missing input length validation in sub_453DC. The function copies user-supplied parameters from the HTTP request body into a stack buffer without verifying that the source data fits the destination. Embedded routers commonly rely on legacy C string-handling routines such as strcpy and sprintf, which do not perform bounds checking and produce classic overflow conditions when fed oversized input.

Attack Vector

The attack vector is network-based. An attacker authenticates to the router web interface with low privileges, then submits a crafted POST request to /goform/formConfigApConfTemp containing an oversized parameter value. The malformed input overflows the destination buffer inside sub_453DC, corrupting adjacent memory. With the public proof of concept now available, attackers can adapt the payload to overwrite return addresses or function pointers and pivot to arbitrary code execution.

No verified exploitation code is published in trusted advisory sources. Refer to the GitHub CVE Documentation and VulDB entry #323206 for technical context.

Detection Methods for CVE-2025-10171

Indicators of Compromise

HTTP POST requests to /goform/formConfigApConfTemp containing abnormally long parameter values or non-printable byte sequences
Unexpected reboots, web service crashes, or watchdog resets on UTT 1250GW devices following inbound management traffic
Outbound connections from the router to unfamiliar hosts, suggesting post-exploitation activity
Authentication events from unusual source addresses immediately preceding malformed POST requests

Detection Strategies

Inspect HTTP traffic to the router management interface for requests targeting /goform/formConfigApConfTemp with parameter lengths beyond expected limits
Deploy network IDS signatures that flag oversized form fields directed at UTT goform endpoints
Correlate router crash logs and syslog reboot events with preceding inbound HTTP sessions
Baseline normal administrative request patterns and alert on deviations targeting the affected endpoint

Monitoring Recommendations

Forward router syslog and authentication events to a centralized logging platform for retention and correlation
Monitor for repeated failed logins followed by POST requests to /goform/ paths
Track device availability metrics to detect denial-of-service patterns consistent with exploit attempts
Review firewall logs for unsolicited inbound connections to the router management port from public networks

How to Mitigate CVE-2025-10171

Immediate Actions Required

Restrict access to the UTT 1250GW web management interface to trusted administrative networks only
Disable remote WAN-side administration and require VPN access for management tasks
Rotate administrator credentials and enforce strong passwords to limit low-privilege attacker access
Inventory affected devices and evaluate replacement options, as the vendor did not respond to coordinated disclosure

Patch Information

No vendor patch is available. According to the CVE record, UTT was contacted before disclosure but did not respond. Organizations operating UTT 1250GW devices should treat the firmware as unsupported and plan for migration to an actively maintained platform. Monitor VulDB #323206 for any future vendor updates.

Workarounds

Place the device behind a perimeter firewall and block external access to TCP ports used by the management interface
Use an upstream reverse proxy or WAF to filter HTTP requests to /goform/formConfigApConfTemp and reject oversized parameters
Segment the router from sensitive internal networks to limit blast radius if the device is compromised
Replace the affected device with a supported router model when feasible

bash

# Example iptables rule to restrict management interface to a trusted subnet
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP