CVE-2025-11323: UTT 1250GW Buffer Overflow Vulnerability

CVE-2025-11323 Overview

CVE-2025-11323 is a buffer overflow vulnerability in the UTT 1250GW router firmware versions up to v2v3.2.2-200710. The flaw resides in the strcpy function within the /goform/formUserStatusRemark endpoint. Attackers can trigger memory corruption by manipulating the Username argument with an overly long input. The vulnerability is remotely exploitable and the exploit has been publicly disclosed. The vendor was contacted prior to disclosure but did not respond. This issue is classified under [CWE-119], improper restriction of operations within the bounds of a memory buffer.

Critical Impact
Remote attackers with low-level privileges can corrupt router memory through the Username parameter, potentially leading to denial of service or arbitrary code execution on the affected device.

Affected Products

UTT 1250GW router (hardware version 2.0)
UTT 1250GW firmware versions up to v2v3.2.2-200710
Deployments exposing the web management interface at /goform/formUserStatusRemark

Discovery Timeline

2025-10-06 - CVE-2025-11323 published to NVD
2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-11323

Vulnerability Analysis

The vulnerability exists in the web management interface of the UTT 1250GW router. The handler bound to /goform/formUserStatusRemark processes HTTP requests that include a Username parameter. The handler passes the user-supplied value directly to strcpy without validating the input length against the destination buffer size. Attackers submit a request containing an oversized Username value to overwrite adjacent memory, including stack frame data such as the saved return address. Successful exploitation enables denial of service and may permit arbitrary code execution within the context of the router's web service.

Root Cause

The root cause is the unsafe use of strcpy in the formUserStatusRemark handler. The function copies attacker-controlled data into a fixed-size buffer without bounds checking. Embedded router firmware frequently lacks modern memory protections such as stack canaries, ASLR, or non-executable stacks, which amplifies the impact of classic buffer overflows.

Attack Vector

The attack vector is network-based and requires authenticated access to the router's management interface. An attacker sends a crafted HTTP POST request to /goform/formUserStatusRemark containing a Username field with a payload exceeding the destination buffer length. The vulnerability is reachable wherever the web interface is exposed, including LAN segments and any WAN-side deployments where remote administration is enabled. No verified exploit code is republished here. Technical details are available in the GitHub Issue Discussion and the VulDB CVE Analysis.

Detection Methods for CVE-2025-11323

Indicators of Compromise

HTTP POST requests to /goform/formUserStatusRemark containing abnormally long Username field values
Unexpected reboots, crashes, or service restarts of the UTT 1250GW web management daemon
Unusual outbound connections originating from the router following inbound management traffic
Configuration changes or new administrative sessions that cannot be attributed to authorized activity

Detection Strategies

Inspect web server logs on the router for requests targeting formUserStatusRemark with parameter lengths exceeding typical username sizes
Deploy network IDS signatures that flag HTTP requests to UTT management endpoints containing oversized POST parameters
Correlate router crash events with preceding HTTP requests to identify exploitation attempts

Monitoring Recommendations

Forward router syslog and web access logs to a centralized SIEM for retention and correlation
Alert on management interface access from untrusted networks or unexpected source addresses
Monitor for repeated authentication attempts followed by malformed POST requests against /goform/ endpoints

How to Mitigate CVE-2025-11323

Immediate Actions Required

Restrict access to the router's web management interface to trusted management VLANs only
Disable WAN-side remote administration on UTT 1250GW devices until a patch is available
Rotate administrative credentials and audit all configured user accounts on affected devices
Treat any UTT 1250GW exposed to untrusted networks as potentially compromised and inspect configuration for unauthorized changes

Patch Information

No vendor patch is available at the time of publication. According to the CVE record, the vendor was contacted prior to public disclosure but did not respond. Affected organizations should track the VulDB CVE Analysis for any future vendor advisory and consider replacing affected hardware with supported equipment.

Workarounds

Place the UTT 1250GW behind an upstream firewall that blocks inbound HTTP and HTTPS access to the management interface
Apply ACLs that permit management connections only from a dedicated administrative jump host
Segment router management interfaces away from user networks to limit lateral exploitation paths
Plan migration to a vendor-supported device given the lack of vendor response to the disclosure

bash

# Example ACL restricting router management access to a single admin host
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.5 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.5 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP