CVE-2025-10756 Overview
CVE-2025-10756 is a buffer overflow vulnerability in UTT HiPER 840G routers running firmware versions up to 3.1.1-190328. The flaw exists in an unspecified function within the /goform/getOneApConfTempEntry endpoint. Attackers can trigger the overflow by manipulating the tempName parameter, allowing remote exploitation over the network. The exploit has been publicly disclosed, increasing the risk of opportunistic attacks against exposed devices. The vendor was contacted prior to disclosure but did not respond, leaving affected users without an official patch. The vulnerability is tracked under [CWE-119], improper restriction of operations within the bounds of a memory buffer.
Critical Impact
Remote attackers with low privileges can exploit the tempName argument to overflow a buffer, potentially leading to arbitrary code execution or device compromise on internet-exposed UTT HiPER 840G routers.
Affected Products
- UTT HiPER 840G hardware (version 3.0)
- UTT 840G firmware up to 3.1.1-190328
- Deployments exposing the /goform/getOneApConfTempEntry web management endpoint
Discovery Timeline
- 2025-09-20 - CVE-2025-10756 published to NVD
- 2026-01-08 - Last updated in NVD database
Technical Details for CVE-2025-10756
Vulnerability Analysis
The vulnerability resides in the web management interface of the UTT HiPER 840G router. The handler for /goform/getOneApConfTempEntry processes the tempName HTTP parameter without enforcing a safe length boundary. When an attacker submits an oversized value, the input is copied into a fixed-size buffer, corrupting adjacent memory regions. This buffer overflow can overwrite control data such as return addresses or function pointers in the router's HTTP service process. Successful exploitation can crash the device or enable execution of attacker-controlled code with the privileges of the management service.
Public technical details, including proof-of-concept material, are documented in the GitHub CVE Details and VulDB entry 325111.
Root Cause
The root cause is missing input validation on the tempName argument before it is written into a fixed-length buffer. The handler does not enforce length checks or use bounded copy functions, which classifies the defect as [CWE-119]. UTT's failure to respond to coordinated disclosure means no vendor-validated root cause analysis or fix is available.
Attack Vector
The attack is delivered over the network against the router's web administration interface. An authenticated attacker with low-level credentials can issue a crafted HTTP request to /goform/getOneApConfTempEntry containing an oversized tempName value. Devices that expose management interfaces to the WAN, or that share a LAN with a compromised host, are at the highest risk. Public exploit availability allows commodity scanning and exploitation.
No verified exploitation code is published in vetted sources. Refer to the VulDB submission 645678 for further references.
Detection Methods for CVE-2025-10756
Indicators of Compromise
- HTTP POST or GET requests targeting /goform/getOneApConfTempEntry with abnormally long tempName parameter values.
- Unexpected reboots, web service crashes, or watchdog resets on UTT HiPER 840G routers.
- New outbound connections from the router to unfamiliar hosts following management interface access.
Detection Strategies
- Inspect HTTP traffic for requests to /goform/getOneApConfTempEntry and alert when tempName exceeds expected length thresholds.
- Correlate router syslog entries for HTTP service crashes with preceding management-plane requests from non-administrative sources.
- Apply network IDS signatures matching long-string payloads against the affected URI pattern.
Monitoring Recommendations
- Forward router logs to a centralized SIEM and create alerts for repeated access to administrative goform endpoints.
- Monitor authentication logs for low-privilege accounts initiating configuration template queries.
- Track baseline CPU, memory, and reboot metrics on UTT devices to surface anomalous behavior consistent with exploitation attempts.
How to Mitigate CVE-2025-10756
Immediate Actions Required
- Restrict access to the router's web management interface so it is reachable only from trusted management subnets.
- Disable WAN-side administration on all UTT HiPER 840G devices until a vendor patch is published.
- Rotate all administrative credentials and remove unused low-privilege management accounts.
- Inventory exposed UTT devices using external attack-surface scans and isolate any reachable from the internet.
Patch Information
No vendor patch is available. UTT did not respond to the disclosure attempt referenced in the VulDB advisory. Organizations operating affected hardware should evaluate replacement with a supported platform if no fix is released.
Workarounds
- Place the router behind an upstream firewall and block inbound HTTP/HTTPS to the management interface.
- Enforce ACLs limiting /goform/ URIs to specific administrator source IP addresses.
- Disable remote management features and require VPN access for any administrative session.
- Segment the management VLAN from user and guest networks to reduce LAN-side exposure.
# Example upstream firewall rule to block external access to the router admin UI
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -m iprange ! --src-range <admin_subnet> -j DROP
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -m iprange ! --src-range <admin_subnet> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
