CVE-2026-76003 in HiPER 1200GW
Summary
by MITRE • 08/19/2026
A weakness has been identified in UTT HiPER 1200GW up to 2.5.3-170306. Affected is the function strcpy of the file /goform/formGroupConfig. Executing a manipulation of the argument timestart can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
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Analysis
by VulDB Data Team • 08/19/2026
The UTT HiPER 1200GW, specifically versions up through firmware release 2.5.3-170306, contains a critical security vulnerability rooted in improper memory management within its web-based configuration interface. The flaw resides in the handling of input data by the strcpy function located in the /goform/formGroupConfig script or module. This component is responsible for processing group configuration settings submitted via HTTP requests from users interacting with the device's administrative portal. The specific weakness involves a failure to validate the length of user-supplied arguments before copying them into fixed-size stack buffers, creating a classic buffer overflow condition that can be triggered remotely by an unauthenticated attacker.
From a technical perspective, this vulnerability is classified under CWE-120: Buffer Copy without Checking Size of Input (Classic Buffer Overflow). The strcpy function in the C programming language copies characters from a source string to a destination buffer until it encounters a null terminator, but it does not perform any bounds checking on the size of the destination buffer. When an attacker manipulates the timestart argument within the HTTP request payload sent to /goform/formGroupConfig, they can supply a string that exceeds the allocated stack space for this variable. This overflow overwrites adjacent memory locations on the call stack, including return addresses and other critical control data structures. By carefully crafting the input, an attacker can overwrite these values with shellcode or pointers to malicious code segments, thereby gaining arbitrary code execution capabilities within the context of the vulnerable application process.
The operational impact of this vulnerability is severe due to its remote exploitability and the availability of public proof-of-concept exploits. Because the affected function is accessible via a web interface typically exposed on standard HTTP ports, an attacker does not need physical access or prior authentication credentials if default settings are in place or if other vulnerabilities exist that allow initial access. The presence of publicly available exploitation tools significantly lowers the barrier to entry for malicious actors, increasing the likelihood of automated attacks and widespread compromise. Successful exploitation allows the attacker to execute arbitrary commands on the underlying operating system hosting the router's firmware. This can lead to a complete takeover of the device, enabling the attacker to use it as part of a botnet, intercept network traffic, pivot into internal networks, or install persistent backdoors for long-term access and data exfiltration.
This vulnerability aligns with several tactics in the MITRE ATT&CK framework, particularly Initial Access via Web Application Exploitation (T1190) and Execution via Command and Script Interpreter (T1059). The attacker leverages a web application flaw to gain initial foothold and subsequently executes system-level commands. Furthermore, this scenario reflects common patterns found in embedded systems where legacy C code is used without modern security mitigations such as stack canaries or non-executable memory protections being fully effective against sophisticated overflows.
Mitigation strategies must focus on immediate remediation through firmware updates provided by the vendor, which should include proper input validation and the use of safer string handling functions like strncpy or snprintf that enforce length limits. In cases where patching is not immediately feasible, network-level controls such as firewall rules restricting access to the administrative interface from untrusted networks can reduce exposure. Additionally, implementing Web Application Firewalls (WAF) with signatures capable of detecting buffer overflow attempts in HTTP parameters may provide a layer of defense against exploitation until the underlying code defect is resolved. Regular security audits and static analysis tools should be employed during development cycles to identify similar unsafe memory operations before deployment.