Delta Electronics CNCSoft

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1. EXECUTIVE SUMMARY

• CVSS v4 7.3
• ATTENTION: Low attack complexity
• Vendor: Delta Electronics
• Equipment: CNCSoft
• Vulnerabilities: Out-of-bounds Write

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to execute code within the context of the current process.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Delta Electronics reports the following versions of CNCSoft, a human-machine interface, are affected:

• CNCSoft: v1.01.34 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 OUT-OF-BOUNDS WRITE CWE-787

Delta Electronics CNCSoft does not properly validate user-supplied files. If a user opens a maliciously crafted file, an attacker can leverage this vulnerability to execute code within the context of the current process.

CVE-2025-47724 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.7 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-47724. A base score of 7.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.2.2 OUT-OF-BOUNDS WRITE CWE-787

Delta Electronics CNCSoft does not properly validate user-supplied files. If a user opens a maliciously crafted file, an attacker can leverage this vulnerability to execute code within the context of the current process.

CVE-2025-47725 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.7 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-47725. A base score of 7.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.2.3 OUT-OF-BOUNDS WRITE CWE-787

Delta Electronics CNCSoft does not properly validate user-supplied files. If a user opens a maliciously crafted file, an attacker can leverage this vulnerability to execute code within the context of the current process.

CVE-2025-47726 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.7 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-47726. A base score of 7.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.2.4 OUT-OF-BOUNDS WRITE CWE-787

Delta Electronics CNCSoft does not properly validate user-supplied files. If a user opens a maliciously crafted file, an attacker can leverage this vulnerability to execute code within the context of the current process.

CVE-2025-47727 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.7 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-47727. A base score of 7.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Taiwan

3.4 RESEARCHER

Natnael Samson working with Trend Micro Zero Day Initiative reported these vulnerabilities to CISA.

4. MITIGATIONS

Delta Electronics does not plan to address these vulnerabilities because the A-series CNC products supported by CNCSoft have been discontinued. CNCSoft will be removed from the Delta Download Center. Delta recommends users migrate to newer Delta CNC products along with their corresponding software as soon as possible.

Delta Electronics offers the following general recommendations:

• Do not click on untrusted Internet links or open unsolicited email attachments.
• Avoid exposing control systems and equipment to the Internet.
• Place systems and devices behind a firewall and isolate them from the business network.
• When remote access is required, use a secure access method, such as a virtual private network (VPN).

For any product-related support inquiries, contact Delta through the company’s portal page to request any information or materials you may need.

Reference Delta’s product cybersecurity advisory for more information about these vulnerabilities.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. These vulnerabilities are not exploitable remotely.

5. UPDATE HISTORY

• June 24, 2025: Initial Publication