Delta Electronics DVP12SE PLC

Summary

Delta Electronics DVP12SE PLCs are affected by two critical vulnerabilities (CVE-2026-12819, CVE-2026-12818) allowing unauthenticated remote attackers to issue commands, modify operational values, and interfere with control logic. The flaws, rated 9.8 CVSS, stem from missing authentication and resource allocation issues in the Modbus TCP service. Delta Electronics is working on a fix and recommends mitigations including IP filtering, password protection, and network isolation.

Full text

ICS Advisory Delta Electronics DVP12SE PLC Release DateJune 30, 2026 Alert CodeICSA-26-181-07 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to remotely issue commands, modify operational values, interfere with control logic, and alter device behavior without authentication or privilege enforcement. The following versions of Delta Electronics DVP12SE PLC are affected: DVP12SE PLC vers:all/* (CVE-2026-12819, CVE-2026-12818) CVSS Vendor Equipment Vulnerabilities v3 9.8 Delta Electronics Delta Electronics DVP12SE PLC Missing Authentication for Critical Function, Allocation of Resources Without Limits or Throttling Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Taiwan Vulnerabilities Expand All + CVE-2026-12819 The Delta Electronics DVP12SE PLC exposes a Modbus TCP service over a specified port without authentication or access control, permitting unauthenticated interaction with security-sensitive PLC functions. The device accepts Modbus commands from any reachable network source without requiring credentials, privilege validation, or operator approval, allowing unauthorized read and write access to coils, holding registers, operational memory, relay states, and process control functions. View CVE Details Affected Products Delta Electronics DVP12SE PLC Vendor:Delta Electronics Product Version:Delta Electronics DVP12SE PLC: vers:all/* Product Status:known_affected Remediations MitigationDelta Electronics is aware of these vulnerabilities and is currently working on a fix. MitigationDelta Electronics recommends users apply the following workarounds: MitigationEnable the IP Filter feature: Configure and enable the PLC's built-in IP Filter function via the programming software. Restrict access exclusively to the IP addresses of trusted devices (such as designated HMI panels or SCADA hosts) to block unauthorized network access.Set up PLC password protection: Enable password protection for the PLC within the programming software to ensure the device's core control logic and parameters cannot be easily downloaded, overwritten, or tampered with.Implement network isolation and firewall protection: Deploy the PLC within an independent local area network (OT control network) secured by a firewall. Never connect the device directly to the office network or the Internet. If remote access is required, enforce the use of a secure, authorized VPN tunnel. MitigationFor more information refer to Delta Electronic's advisory page https://www.deltaww.com/en-US/service-support/product-cybersecurity/advisory.https://www.deltaww.com/en-US/service-support/product-cybersecurity/advisory Relevant CWE: CWE-306 Missing Authentication for Critical Function Metrics CVSS Version Base Score Base Severity Vector String 3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 4.0 9.3 CRITICAL CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-12818 Delta Electronics DVP12SE PLCs are susceptible to a resource allocation vulnerability without limits or throttling (CWE-770) within their Modbus TCP service. A remote attacker could exploit this vulnerability by flooding the Modbus port (TCP/502) with a continuous stream of raw network packets or specially crafted and malformed packets. View CVE Details Affected Products Delta Electronics DVP12SE PLC Vendor:Delta Electronics Product Version:Delta Electronics DVP12SE PLC: vers:all/* Product Status:known_affected Remediations MitigationDelta Electronics is aware of these vulnerabilities and is currently working on a fix. MitigationDelta Electronics recommends users apply the following workarounds: MitigationEnable the IP Filter feature: Configure and enable the PLC's built-in IP Filter function via the programming software. Restrict access exclusively to the IP addresses of trusted devices (such as designated HMI panels or SCADA hosts) to block unauthorized network access.Set up PLC password protection: Enable password protection for the PLC within the programming software to ensure the device's core control logic and parameters cannot be easily downloaded, overwritten, or tampered with.Implement network isolation and firewall protection: Deploy the PLC within an independent local area network (OT control network) secured by a firewall. Never connect the device directly to the office network or the Internet. If remote access is required, enforce the use of a secure, authorized VPN tunnel. MitigationFor more information refer to Delta Electronic's advisory page https://www.deltaww.com/en-US/service-support/product-cybersecurity/advisory.https://www.deltaww.com/en-US/service-support/product-cybersecurity/advisory Relevant CWE: CWE-770 Allocation of Resources Without Limits or Throttling Metrics CVSS Version Base Score Base Severity Vector String 3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 4.0 9.3 CRITICAL CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Acknowledgments Adm Bin Harbi (0xnoag) - Corvo Security reported these vulnerabilities to CISA Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. 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: Do not click web links or open attachments in unsolicited email messages. 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. Revision History Initial Release Date: 2026-06-30 Date Revision Summary 2026-06-30 1 Initial Publication Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor Delta Electronics Tags Sector: Critical Manufacturing Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Jun 30, 202

Indicators of Compromise

• cve — CVE-2026-12819
• cve — CVE-2026-12818

Entities