CVE-2025-10953: UTT 1200GW Buffer Overflow Vulnerability

CVE-2025-10953 Overview

CVE-2025-10953 is a buffer overflow vulnerability affecting UTT 1200GW and 1250GW routers running firmware versions up to 3.0.0-170831 and 3.2.2-200710. The flaw resides in the /goform/formApMail endpoint, where manipulation of the senderEmail parameter triggers a buffer overflow [CWE-119]. Attackers can exploit the issue remotely over the network with low-privilege credentials. The exploit has been disclosed publicly, increasing the risk of opportunistic attacks. The vendor was contacted prior to disclosure but did not respond, leaving affected devices without an official patch.

Critical Impact
Remote attackers with low-level authentication can corrupt memory on UTT 1200GW and 1250GW routers, potentially leading to arbitrary code execution or denial of service on perimeter network devices.

Affected Products

UTT 1200GW (firmware up to 3.0.0-170831)
UTT 1250GW (firmware up to 3.2.2-200710)
UTT 1250GW hardware revision 2.0

Discovery Timeline

2025-09-25 - CVE-2025-10953 published to NVD
2026-02-10 - Last updated in NVD database

Technical Details for CVE-2025-10953

Vulnerability Analysis

The vulnerability affects the web management interface of UTT 1200GW and 1250GW routers. The /goform/formApMail handler processes the senderEmail POST parameter without enforcing proper boundary checks on input length. Submitting an oversized string overruns the fixed-size destination buffer, corrupting adjacent memory regions including stack frames or heap metadata. This class of weakness is categorized as Improper Restriction of Operations within the Bounds of a Memory Buffer [CWE-119]. Successful exploitation can result in service crashes, arbitrary code execution within the router process context, or full device compromise. Because the affected devices function as gateway routers, exploitation could enable attackers to pivot into internal networks or intercept traffic.

Root Cause

The root cause is the absence of bounds validation on the senderEmail argument before it is copied into a fixed-size buffer inside the formApMail form handler. The firmware's HTTP form processing logic uses unsafe string operations that do not respect destination buffer capacity, allowing attacker-controlled data to overflow into adjacent memory.

Attack Vector

The attack vector is network-based and requires low-privilege authenticated access to the router's web administration interface. An attacker sends a crafted HTTP POST request to /goform/formApMail containing an oversized senderEmail value. Public disclosure of exploitation details lowers the barrier to weaponization. The exploit can be delivered remotely without user interaction, making exposed management interfaces particularly attractive targets.

No verified proof-of-concept code is included in this advisory. Refer to the GitHub CVE Analysis 8, GitHub CVE Analysis 9, and VulDB entry #325824 for technical details.

Detection Methods for CVE-2025-10953

Indicators of Compromise

Unusually long senderEmail parameter values in HTTP POST requests targeting /goform/formApMail
Unexpected reboots, crashes, or watchdog resets on UTT 1200GW or 1250GW devices
Unauthorized authentication attempts to the router web management interface from external IP addresses
Anomalous outbound traffic from the router indicating possible post-exploitation activity

Detection Strategies

Inspect HTTP request logs from UTT router management interfaces for oversized POST bodies sent to /goform/formApMail
Deploy network intrusion detection signatures that flag senderEmail parameter values exceeding reasonable email address length limits
Correlate management interface access events with source IP reputation feeds to identify untrusted access attempts

Monitoring Recommendations

Forward router syslog and HTTP access logs to a central SIEM for retention and analysis
Alert on repeated connections to the router web interface from outside trusted administrative subnets
Monitor device availability and CPU utilization for anomalies that may indicate exploitation attempts

How to Mitigate CVE-2025-10953

Immediate Actions Required

Restrict access to the router web management interface to trusted administrative networks only, disabling WAN-side administration
Place affected UTT 1200GW and 1250GW devices behind a firewall that filters inbound HTTP traffic to management ports
Rotate administrative credentials and enforce strong authentication to limit the pool of accounts that could leverage the low-privilege requirement
Evaluate replacement options for affected devices given the vendor's lack of response to the disclosure

Patch Information

No vendor patch is currently available. According to the CVE disclosure, UTT was contacted prior to public disclosure but did not respond. Affected organizations should monitor VulDB #325824 and the vendor's support channels for any future firmware updates.

Workarounds

Disable remote administration on the WAN interface and restrict the management interface to a dedicated VLAN
Implement upstream access control lists that block untrusted source addresses from reaching the router's HTTP service
Segment the affected routers from sensitive internal assets to reduce blast radius if compromise occurs
Consider migrating to actively supported networking hardware where vendor security response is timely

bash

# Example: restrict access to router management interface via upstream firewall
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -s <admin_subnet> -j ACCEPT
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -j DROP