CVE-2026-7418 Overview
A buffer overflow vulnerability has been identified in UTT HiPER 1250GW network devices running firmware versions up to 3.2.7-210907-180535. This vulnerability affects the strcpy function within the file route/goform/NTP, where improper handling of the Profile argument allows an attacker to trigger a buffer overflow condition. The vulnerability is remotely exploitable, and technical details have been publicly disclosed.
Critical Impact
Remote attackers with low-level privileges can exploit this buffer overflow vulnerability to potentially achieve code execution on affected UTT HiPER 1250GW devices, compromising network infrastructure integrity and confidentiality.
Affected Products
- UTT HiPER 1250GW firmware versions up to 3.2.7-210907-180535
- UTT HiPER 1250GW devices with NTP configuration functionality exposed
Discovery Timeline
- April 29, 2026 - CVE-2026-7418 published to NVD
- April 29, 2026 - Last updated in NVD database
Technical Details for CVE-2026-7418
Vulnerability Analysis
This vulnerability stems from improper bounds checking in the NTP configuration handler of the UTT HiPER 1250GW router firmware. The affected code path resides in route/goform/NTP, where the strcpy function is used to copy user-supplied data from the Profile argument without proper length validation. This classic buffer overflow pattern allows attackers to overwrite adjacent memory regions, potentially corrupting stack variables, return addresses, or other critical memory structures.
The vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), which encompasses a broad range of memory safety issues. In this case, the unsafe use of strcpy instead of bounds-checked alternatives like strncpy or strlcpy creates the exploitable condition.
Root Cause
The root cause of this vulnerability is the unsafe use of the strcpy function in the NTP configuration handler. The strcpy function copies data from a source buffer to a destination buffer without checking whether the destination buffer is large enough to accommodate the source data. When an attacker supplies an overly long value for the Profile argument, the function writes beyond the allocated buffer boundaries, causing memory corruption.
This represents a common firmware vulnerability pattern in embedded devices where legacy C code lacks modern memory safety practices. The absence of input validation on the Profile parameter before the copy operation exacerbates the issue.
Attack Vector
The attack can be launched remotely over the network, requiring only low-level authentication to access the vulnerable NTP configuration endpoint. An attacker would craft a malicious HTTP request to the goform/NTP endpoint with an oversized Profile parameter value. The attack does not require user interaction and can be automated.
The exploitation mechanism involves:
- Authenticating to the device with minimal privileges
- Sending a crafted request to the route/goform/NTP endpoint
- Including an oversized payload in the Profile parameter
- The strcpy function copies the payload, overflowing the destination buffer
- Depending on the memory layout, the attacker may achieve code execution or denial of service
Technical details regarding this vulnerability have been publicly disclosed via the GitHub IOT Vulnerability Report.
Detection Methods for CVE-2026-7418
Indicators of Compromise
- Unusual HTTP POST requests to /goform/NTP with abnormally large Profile parameter values
- Device crashes or unexpected reboots following configuration changes
- Suspicious network traffic patterns targeting the device management interface
- Anomalous process behavior or memory utilization on the affected device
Detection Strategies
- Monitor HTTP traffic to UTT HiPER 1250GW devices for requests containing oversized parameters in the Profile field
- Implement network intrusion detection rules to identify buffer overflow attempts against /goform/NTP endpoints
- Deploy web application firewall rules to block requests with parameter values exceeding normal thresholds
- Review device logs for failed or malformed NTP configuration requests
Monitoring Recommendations
- Enable detailed logging on UTT HiPER 1250GW devices and forward logs to a centralized SIEM
- Establish baseline network behavior for management interface traffic and alert on deviations
- Implement network segmentation to isolate IoT and network devices from general user traffic
- Conduct regular vulnerability scans against network infrastructure devices
How to Mitigate CVE-2026-7418
Immediate Actions Required
- Restrict network access to the device management interface using firewall rules or access control lists
- Implement network segmentation to prevent untrusted users from reaching the vulnerable endpoint
- Disable remote management functionality if not operationally required
- Monitor for exploitation attempts while awaiting a vendor patch
Patch Information
At the time of publication, no official patch information has been released by UTT. Organizations should monitor vendor communications and the following resources for updates:
Workarounds
- Implement strict access control lists (ACLs) to limit management interface access to trusted IP addresses only
- Place affected devices behind a firewall that filters incoming requests to sensitive endpoints
- Consider deploying a reverse proxy with input validation capabilities in front of the management interface
- Evaluate replacing affected devices with alternatives that receive regular security updates
# Example: Restrict management interface access via iptables
# Allow management access only from trusted admin network
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
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.
