CVE-2026-82770 in RP-WAH-SR1
Summary
by MITRE • 09/14/2026
Buffer overflow vulnerability exists in Contec RP-WAH-SR Series. If a remote attacker sends a specially crafted request to the product's web service, an arbitrary program may be executed.
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Analysis
by VulDB Data Team • 09/14/2026
The identified security flaw resides within the Contec RP-WAH-SR series of industrial networking equipment and is classified as a buffer overflow vulnerability affecting its embedded web server interface. This specific type of memory corruption error occurs when the application writes more data to a fixed-length block of memory, or buffer, than it can hold. In this context, the flaw allows an external actor to exceed the allocated memory boundaries by submitting a specially crafted HTTP request that contains oversized input parameters. The vulnerability stems from insufficient boundary checks during the processing of incoming web service requests, which is a critical oversight in software designed for industrial control systems where robustness against malformed inputs is paramount.
From a technical perspective, this buffer overflow enables an attacker to overwrite adjacent memory locations on the device's stack or heap. By carefully crafting the payload, it is possible to manipulate the return address of the function call, thereby redirecting the execution flow of the program. This manipulation allows for the arbitrary execution of code with the privileges granted to the web service process. Given that these devices often operate as gateways between corporate networks and operational technology environments, achieving remote code execution through this vector represents a severe compromise of device integrity. The attacker does not require authentication if the vulnerable endpoint is accessible over the network, making it particularly dangerous in unsegmented industrial zones.
The operational impact of exploiting this vulnerability extends beyond mere unauthorized access to the specific device. Since the RP-WAH-SR series serves as an interface for monitoring and controlling industrial processes, successful exploitation could allow a threat actor to disrupt critical infrastructure operations. An attacker could inject malicious commands into the system, potentially leading to physical damage to connected machinery, data exfiltration of sensitive operational parameters, or using the compromised device as a pivot point for lateral movement within the network. This aligns with common attack patterns observed in industrial espionage and sabotage campaigns where availability and integrity are primary targets.
In terms of industry standards, this vulnerability is best described by CWE-120, which covers Buffer Copy without Checking Size of Input, indicating that the software did not verify whether the input data fit within the allocated buffer space. Furthermore, from a tactical standpoint, this exploit technique corresponds to ATT&CK ID T1190, known as Exploit Public-Facing Application. This classification highlights how adversaries leverage vulnerabilities in internet-accessible services to gain initial access or escalate privileges without needing prior foothold inside the network perimeter. The lack of proper input validation is a fundamental design flaw that violates secure coding principles essential for embedded systems operating in hostile environments.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary defense is to apply vendor-provided firmware updates or patches that address this specific buffer overflow issue by implementing strict length checks before processing incoming data. If patching is not immediately feasible, network-level controls should be employed to restrict access to the web service interface only from trusted IP addresses using firewalls or VLAN segmentation. Additionally, deploying intrusion detection systems configured with signatures for known exploitation attempts related to HTTP request anomalies can provide an additional layer of defense. Regular security assessments and code reviews focusing on memory safety are essential to prevent similar vulnerabilities in future firmware releases, ensuring that the industrial network remains resilient against remote exploitation attempts.