CVE-2026-82782 in Remote IO Coupler Unit CPSN-MCB271-*
Summary
by MITRE • 09/14/2026
Out-of-bounds write vulnerability exists in CONPROSYS nano Series. Receiving a specially crafted request created and sent by a remote attacker may cause a denial-of-service (DoS) condition.
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Analysis
by VulDB Data Team • 09/14/2026
The identified security flaw represents an out-of-bounds write vulnerability within the firmware or software stack of the CONPROSYS nano Series industrial control system devices. This specific class of memory corruption error occurs when the application writes data to a buffer beyond its allocated boundaries, potentially overwriting adjacent memory structures such as function pointers, return addresses, or critical metadata used by the operating system or runtime environment. In the context of embedded systems and programmable logic controllers like those in the CONPROSYS nano Series, which are often deployed in time-critical industrial environments, the integrity of these low-level memory operations is paramount for stable operation. The vulnerability stems from insufficient validation of input data received via network interfaces, allowing a remote attacker to craft a maliciously formatted request that triggers this erroneous write condition.
From an operational perspective, the immediate consequence of exploiting this out-of-bounds write is typically a denial-of-service condition rather than arbitrary code execution in many embedded scenarios due to strict memory protection mechanisms or lack of executable stack permissions common in industrial firmware. When the attacker sends the specially crafted request, the resulting memory corruption causes the application process to crash, leading to an unresponsive device state. This disruption halts all control operations managed by the affected unit, including monitoring and actuation functions critical to industrial processes. The impact extends beyond simple downtime; it can lead to significant financial losses due to production stoppages and potentially compromise safety if the sudden loss of control affects physical machinery or hazardous materials handling systems without proper fail-safe mechanisms engaging immediately.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-787, which classifies out-of-bounds writes as a critical memory safety issue. Furthermore, from an offensive security perspective, this attack vector corresponds to the ATT&CK technique T1499, specifically categorized under Endpoint Denial of Service or more broadly within Network Service Scanning and Exploitation if it involves probing for service availability before exploitation. The ability to trigger a crash remotely via network requests places this vulnerability in the high-risk category for devices that are often exposed on industrial networks where segmentation may be less rigorous than in corporate IT environments.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Vendors should release firmware updates that implement strict bounds checking for all buffer operations, particularly those handling network input data from untrusted sources. Developers must adopt secure coding practices such as using safe string manipulation functions and implementing static analysis tools during the development lifecycle to detect memory safety violations early. For operators currently running vulnerable versions, immediate mitigation involves restricting network access to these devices through strict firewall rules that limit inbound traffic to only necessary ports and protocols from authorized management stations. Additionally, deploying intrusion detection systems configured with signatures for malformed packet patterns can help identify attempted exploitation in real-time, allowing security teams to block malicious requests before they trigger the denial-of-service condition.