Delta Electronics CNCSoft-G2 (Update A)
1. EXECUTIVE SUMMARY
- CVSS v4 8.4
- ATTENTION: Low attack complexity
- Vendor: Delta Electronics
- Equipment: CNCSoft-G2
- Vulnerabilities: Stack-based Buffer Overflow, Out-of-bounds Write, Out-of-bounds Read, Heap-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could cause a buffer overflow condition and allow remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Delta Electronics CNCSoft-G2, a human-machine interface (HMI) software, are affected:
- CNCSoft-G2: Version 2.0.0.5 (CVE-2024-39880, CVE-2024-39881, CVE-2024-39882, CVE-2024-39883)
- CNCSoft-G2: Version 2.1.0.10 and prior (CVE-2025-22880)
- CNCSoft-G2: Version 2.1.0.16 and prior (CVE-2024-12858)
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Delta Electronics CNCSoft-G2 lacks proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. If a target visits a malicious page or opens a malicious file an attacker can leverage this vulnerability to execute code in the context of the current process.
CVE-2024-39880 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
A CVSS v4 score has also been calculated for CVE-2024-39880. A base score of 8.4 has been calculated; the CVSS vector string is (CVSS4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).
3.2.2 OUT-OF-BOUNDS WRITE CWE-787
Delta Electronics CNCSoft-G2 lacks proper validation of user-supplied data, which can result in a memory corruption condition. If a target visits a malicious page or opens a malicious file an attacker can leverage this vulnerability to execute code in the context of the current process.
CVE-2024-39881 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
A CVSS v4 score has also been calculated for CVE-2024-39881. A base score of 8.4 has been calculated; the CVSS vector string is (CVSS4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).
3.2.3 OUT-OF-BOUNDS READ CWE-125
Delta Electronics CNCSoft-G2 lacks proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. If a target visits a malicious page or opens a malicious file an attacker can leverage this vulnerability to execute code in the context of the current process.
CVE-2024-39882 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
A CVSS v4 score has also been calculated for CVE-2024-39882. A base score of 8.4 has been calculated; the CVSS vector string is (CVSS4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).
3.2.4 HEAP-BASED BUFFER OVERFLOW CWE-122
Delta Electronics CNCSoft-G2 lacks proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. If a target visits a malicious page or opens a malicious file an attacker can leverage this vulnerability to execute code in the context of the current process.
CVE-2024-39883 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
A CVSS v4 score has also been calculated for CVE-2024-39883. A base score of 8.4 has been calculated; the CVSS vector string is (CVSS4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).
3.2.5 HEAP-BASED BUFFER OVERFLOW CWE-122
Delta Electronics CNCSoft-G2 Version 2.1.0.16 and prior lacks proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. If a target visits a malicious page or opens a malicious file an attacker can leverage this vulnerability to execute code in the context of the current process.
CVE-2024-12858 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
A CVSS v4 score has also been calculated for CVE-2024-12858. A base score of 8.4 has been calculated; the CVSS vector string is (CVSS4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).
3.2.6 HEAP-BASED BUFFER OVERFLOW CWE-122
Delta Electronics CNCSoft-G2 Version 2.1.0.10 and prior lacks proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. If a target visits a malicious page or opens a malicious file an attacker can leverage this vulnerability to execute code in the context of the current process.
CVE-2025-22880 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
A CVSS v4 score has also been calculated for CVE-2025-22880. A base score of 8.4 has been calculated; the CVSS vector string is (CVSS4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).
3.3 BACKGROUND
- CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
Bobby Gould, Fritz Sands, and Natnael Samson working with Trend Micro Zero Day Initiative reported these vulnerabilities to CISA.
4. MITIGATIONS
Delta Electronics recommends users update to v2.1.0.20 or later.
Delta has published Delta-PCSA-2025-00002 in both English and Chinese on their security website to provide more details about these issues.
Delta also recommends the following general security practices:
- Don't click on untrusted Internet links or open unsolicited attachments in emails.
- 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).
If you have any product-related support concerns, please find a contact from Delta's portal page to reach them for any information or materials you may require.
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.
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
- July 09, 2024: Initial Publication
- February 18, 2025: Update A - Updated the Mitigations section to include the fixed version to mitigate CVE-2024-12858 and added CVE-2025-22880
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Vendor
- Delta Electronics