Impact Analysis

Exploitation of this vulnerability poses a high risk to critical infrastructure sectors such as Commercial Facilities, Critical Manufacturing, and Energy.

An attacker could disrupt operations by modifying or deleting components, transferring files, or executing unauthorized commands remotely.

This could lead to operational downtime, loss of control over industrial processes, and potential safety hazards.

CISA recommends minimizing network exposure of affected devices by ensuring they are not accessible from the internet, placing control system networks behind firewalls, isolating them from business networks, and using secure remote access methods such as up-to-date VPNs.

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Detection Guidance

Detection of this vulnerability involves monitoring for suspicious activity related to the Contemporary Controls BASC-20T device, such as unusual packet forging or arbitrary requests to the device.

CISA recommends monitoring network traffic for signs of enumeration, reconfiguration, renaming, deletion of components, file transfers, or remote procedure calls that are unexpected or unauthorized.

Specific commands are not provided in the available resources, but general network monitoring tools like Wireshark or tcpdump can be used to sniff network traffic and identify suspicious packets targeting the BASC-20T device.

Additionally, implementing internal procedures to detect and report suspicious activity is advised.

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Executive Summary

CVE-2025-13926 is a critical vulnerability affecting the Contemporary Controls BASC-20T product, which is now obsolete.

An attacker who successfully exploits this vulnerability can use data obtained by sniffing network traffic to forge packets and make arbitrary requests to the device.

This allows the attacker to enumerate the functionality of each component associated with the programmable logic controller (PLC), as well as to reconfigure, rename, delete components, perform file transfers, and execute remote procedure calls.

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Mitigation Strategies

Immediate mitigation steps include minimizing network exposure of all control system devices, ensuring that the BASC-20T device is not accessible from the internet.

Place control system networks behind firewalls and isolate them from business networks to reduce attack surfaces.

If remote access is necessary, use secure methods such as up-to-date VPNs, while being aware that VPNs themselves may have vulnerabilities.

Perform impact analysis and risk assessments before deploying defensive measures.

Follow CISA’s guidance on industrial control systems cybersecurity, implement defense-in-depth strategies, and monitor for suspicious activity with established internal procedures.

Users of the affected BASC-20T product should contact Contemporary Controls for further remediation information.

Guard against social engineering attacks by avoiding unsolicited email links and attachments.

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Compliance Impact

The provided information does not explicitly address how CVE-2025-13926 affects compliance with common standards and regulations such as GDPR or HIPAA.

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