CVE-2025-10757 Overview
CVE-2025-10757 is a buffer overflow vulnerability affecting UTT 1200GW routers running firmware versions up to 3.0.0-170831. The flaw resides in an unknown function within the /goform/formConfigDnsFilterGlobal endpoint, where the GroupName argument is processed without proper bounds checking. An attacker can trigger the overflow remotely over the network. Public exploit details have been disclosed, increasing the risk of opportunistic exploitation. The vendor was contacted prior to disclosure but did not respond, leaving affected devices without an official fix.
Critical Impact
Remote attackers with low privileges can corrupt memory on UTT 1200GW routers, potentially leading to arbitrary code execution or device compromise.
Affected Products
- UTT 1200GW router hardware
- UTT 1200GW firmware versions up to 3.0.0-170831
- Deployments exposing the web management interface (/goform/formConfigDnsFilterGlobal)
Discovery Timeline
- 2025-09-21 - CVE-2025-10757 published to NVD
- 2026-01-08 - Last updated in NVD database
Technical Details for CVE-2025-10757
Vulnerability Analysis
The vulnerability is a classic buffer overflow categorized under [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer). The affected handler processes HTTP form submissions to the /goform/formConfigDnsFilterGlobal endpoint, which configures DNS filter group settings on the device. When the GroupName parameter is supplied with input exceeding the destination buffer size, the surrounding memory is overwritten. On embedded MIPS or ARM-based router firmware, such overflows commonly corrupt stack frames, including saved return addresses and function pointers. The result can range from device crash and denial of service to attacker-controlled execution flow within the web management process, which typically runs with elevated privileges on the router.
Root Cause
The root cause is the absence of length validation on the GroupName argument before it is copied into a fixed-size buffer. Common patterns in this class of goform handler include unchecked strcpy or sprintf calls operating on user-controlled HTTP form fields. Without bounds checking, oversized inputs overrun the buffer and corrupt adjacent memory.
Attack Vector
The attack vector is network-based and requires low-level privileges on the device's management interface. An attacker reachable on the same network segment, or able to access an internet-exposed router, can submit a crafted HTTP request to /goform/formConfigDnsFilterGlobal with an oversized GroupName value. Because the exploit has been publicly documented, weaponization is straightforward. Successful exploitation impacts confidentiality, integrity, and availability of the device. Refer to the GitHub CVE Documentation and VulDB #325112 for additional technical context.
No verified exploit code is reproduced here. The vulnerability manifests when an HTTP POST request to /goform/formConfigDnsFilterGlobal includes an overlong GroupName parameter, overflowing an internal buffer in the web management binary. See the referenced advisories for proof-of-concept details.
Detection Methods for CVE-2025-10757
Indicators of Compromise
- Unexpected reboots, watchdog resets, or httpd crashes on UTT 1200GW devices
- HTTP POST requests to /goform/formConfigDnsFilterGlobal containing abnormally long GroupName values
- Unusual outbound connections originating from the router's management plane
- Configuration changes to DNS filter groups that were not made by an administrator
Detection Strategies
- Inspect web server and router access logs for requests to /goform/formConfigDnsFilterGlobal with parameter values exceeding typical lengths (for example, more than 64 bytes)
- Deploy network IDS signatures that match oversized GroupName parameter submissions to UTT management endpoints
- Monitor for repeated HTTP 5xx responses or connection resets from the router's web interface, which can indicate exploitation attempts
Monitoring Recommendations
- Centralize router syslog output and alert on httpd process crashes or restarts
- Track administrative authentication events on the device and flag unfamiliar source addresses
- Apply network segmentation telemetry to identify scanning activity targeting /goform/ endpoints
How to Mitigate CVE-2025-10757
Immediate Actions Required
- Restrict access to the UTT 1200GW web management interface to trusted management VLANs only
- Disable remote (WAN-side) administration on affected devices
- Rotate administrative credentials and enforce strong, unique passwords to limit the low-privilege foothold exploitation requires
- Audit DNS filter group configuration for unauthorized modifications
Patch Information
No vendor patch is available. According to the disclosure, the vendor was contacted early but did not respond. Organizations operating UTT 1200GW devices should consider replacement with supported hardware or compensating network controls until an official fix is published. Monitor VulDB #325112 for updates.
Workarounds
- Place the device behind an upstream firewall and block external access to TCP ports used by the web management interface
- Use an HTTP reverse proxy or WAF to drop requests where GroupName exceeds a defined length threshold
- Decommission internet-exposed UTT 1200GW units and replace with vendor-supported alternatives where feasible
# Example iptables rules to restrict router management access 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
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
