CVE-2026-82782: CONPROSYS nano Series DoS Vulnerability

CVE-2026-82782 Overview

CVE-2026-82782 is an out-of-bounds write vulnerability [CWE-787] in the Contec CONPROSYS nano Series of industrial controllers. A remote attacker with low privileges can send a specially crafted request that triggers a memory write outside allocated bounds. Successful exploitation causes a denial-of-service (DoS) condition on the affected device.

The flaw is network-reachable and does not require user interaction. Because CONPROSYS nano devices are commonly deployed as programmable automation controllers in operational technology (OT) environments, a DoS condition can interrupt monitoring and control workflows on the shop floor.

Critical Impact
A remote, authenticated attacker can crash or destabilize CONPROSYS nano Series controllers by sending a crafted request, disrupting industrial process availability.

Affected Products

Contec CONPROSYS nano Series (see vendor advisory for firmware versions)
Industrial deployments using CONPROSYS nano for programmable control
OT/ICS environments exposing the affected service over the network

Discovery Timeline

2026-09-14 - CVE-2026-82782 published to NVD
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-82782

Vulnerability Analysis

The vulnerability is classified as an out-of-bounds write [CWE-787]. When the affected CONPROSYS nano firmware parses a specially crafted network request, it writes data beyond the intended memory buffer. The corruption disrupts program state and terminates or destabilizes the running service.

The published impact is limited to availability. The advisory does not indicate that the flaw enables code execution, information disclosure, or integrity compromise. A crashed controller, however, halts data acquisition and control loops until the device is restarted.

The vulnerability requires low privileges on the target service. This suggests that valid credentials or an authenticated session with the device are needed to reach the vulnerable code path. Exploitation does not require user interaction.

Root Cause

The root cause is insufficient bounds checking during processing of an attacker-controlled request field. The parser accepts input that exceeds the size of the destination buffer and writes past its boundary. Contec's security advisory should be consulted for the specific component and affected firmware versions.

Attack Vector

An attacker delivers a crafted request over the network to the CONPROSYS nano management or protocol service. Because the CVSS vector specifies AV:N/PR:L, the attacker must reach the service and hold at least low-privilege credentials. In OT networks where controllers are flat-networked and shared credentials are common, this bar is often low.

No public proof-of-concept exploit is available. No entries exist in the CISA Known Exploited Vulnerabilities catalog.

Refer to the JVN Vulnerability Announcement and the Contec Security Information Document for vendor-specific technical detail.

Detection Methods for CVE-2026-82782

Indicators of Compromise

Unexpected reboots, service restarts, or watchdog resets on CONPROSYS nano devices
Loss of telemetry or SCADA polling failures from affected controllers
Malformed or oversized requests to CONPROSYS nano management ports in network captures

Detection Strategies

Baseline normal request sizes and field lengths to CONPROSYS nano services, then alert on anomalies
Correlate device availability alarms with authenticated network sessions to the controller
Deploy ICS-aware intrusion detection signatures for malformed CONPROSYS nano protocol traffic

Monitoring Recommendations

Forward controller syslog and SCADA availability events to a centralized SIEM for correlation
Monitor authentication logs on CONPROSYS nano devices for unusual source addresses or brute-force attempts
Track firmware version inventory to identify unpatched controllers across sites

How to Mitigate CVE-2026-82782

Immediate Actions Required

Inventory all CONPROSYS nano Series controllers and identify firmware versions against the Contec advisory
Restrict network access to controller management interfaces using firewalls and OT segmentation
Rotate and strengthen device credentials, and remove shared or default accounts
Apply the vendor firmware update as soon as it is available in your change window

Patch Information

Contec has published a security information document covering CVE-2026-82782. Consult the Contec Security Information Document for the fixed firmware versions and installation procedure. Coordinate patching with plant operations to avoid unplanned downtime.

Workarounds

Place CONPROSYS nano devices behind an ICS firewall that permits traffic only from authorized engineering workstations
Disable remote management interfaces where they are not required for operations
Use jump hosts with strong authentication for administrative access to controllers
Enable logging and alerting on controller availability so a DoS attempt is detected quickly

bash

# Example firewall rule restricting CONPROSYS nano management access
# Replace <mgmt_port>, <engineering_ws>, and <controller_ip> with site-specific values
iptables -A FORWARD -p tcp -s <engineering_ws> -d <controller_ip> --dport <mgmt_port> -j ACCEPT
iptables -A FORWARD -p tcp -d <controller_ip> --dport <mgmt_port> -j DROP