Delta Electronics has issued an urgent security advisory and released COMMGR version 2.10.0 to fix two high-severity vulnerabilities that could let attackers execute arbitrary code on industrial engineering workstations. Tracked as CVE-2025-53418 and CVE-2025-53419, the flaws affect all COMMGR versions up to and including 2.9.0 and can be triggered through specially crafted .isp project files—either sent over a network or opened by an unwitting engineer.

Multiple independent sources, including the U.S. Cybersecurity and Infrastructure Security Agency (CISA), the NVD, Tenable, and CVE Details, have confirmed the issues. The combination of a remote exploitable stack-based buffer overflow and a local code-injection weakness gives adversaries multiple paths into critical manufacturing and industrial control environments.

A Communications Hub at the Heart of Industrial Automation

COMMGR is a communications management and PLC simulation tool embedded in Delta’s engineering software suite. It is used globally in critical manufacturing, energy, and other industrial sectors to configure and simulate programmable logic controllers (PLCs). The software often runs on engineering workstations that connect directly to control networks, making it a high-value target.

Delta has a history of security advisories for this product line, including buffer-overflow fixes in 2018, but the current disclosures represent the most severe risk to date. Because COMMGR installations are pervasive and frequently exposed to shared file repositories, email attachments, and occasionally the internet, the attack surface is deceptively large.

The Two Vulnerabilities: Technical Breakdown

CVE-2025-53418: Remote Stack-Based Buffer Overflow (CVSS 8.6)

This flaw exists in COMMGR’s parser for .isp files. A maliciously crafted file can overflow a fixed-length stack buffer, overwriting critical control data. CISA’s advisory lists a CVSS v3.1 base score of 8.6 (vector: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H), indicating network exploitability with no authentication required. The vendor also calculated a CVSS v4 score of 8.8.

An attacker can send a booby-trapped .isp file over the network to an exposed COMMGR service—for example, a misconfigured remote access gateway—and trigger remote code execution without any user interaction. “The attack complexity is low, and the impact is immediately felt on system availability and, potentially, broader integrity,” an independent researcher noted in the CVE record.

CVE-2025-53419: Code Injection Through File Parsing (CVSS 7.8)

The second vulnerability is an improper control of code generation (CWE-94). When COMMGR opens a specially crafted .isp project file, the software can be tricked into executing attacker-supplied code. The CVSS v3.1 base score is 7.8 (vector: AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), and the vendor’s CVSS v4 score comes in at 8.4. Although local vector in nature, it requires only that a user open the file—a routine action for engineers.

Engineering teams routinely exchange project files via email, USB drives, shared network folders, or cloud repositories. An attacker need only plant a malicious .isp file in a location where an engineer will open it. This makes supply-chain compromises and spear-phishing highly realistic delivery methods.

Where and What Is Affected

The advisory clearly states: “COMMGR: Versions v2.9.0 and prior” are affected. Deployment is global, with a heavy concentration in critical manufacturing. Because many industrial organizations maintain backup images and offline laptops that may still run older COMMGR binaries, patching is not a one-click exercise. IT and OT teams must hunt for all instances across engineering and disaster-recovery assets.

Attack Scenarios: How Real Is the Risk?

Security researchers and the forum analysis outline several plausible attack chains:

  • Internet-facing COMMGR: An organization misconfigures a VPN or firewall, exposing COMMGR’s network service to the internet. An attacker sends a malicious .isp directly to the service, exploits CVE-2025-53418 remotely, and gains a foothold on the engineering workstation.
  • Spear-phishing or supply-chain drop: A malicious actor emails a crafted .isp file to an engineer or places it in a shared project folder. The victim opens the file, triggering CVE-2025-53419. The attacker’s code runs in the engineer’s session and can immediately pivot to PLCs, data historians, or other industrial assets.
  • Chained exploitation: Initial code execution from either vulnerability can be used to disable security tools, steal credentials, deploy ransomware, or manipulate process control logic—potentially causing physical damage or production shutdowns.

The CISA advisory acknowledges that exploitation could allow an attacker to “execute arbitrary code,” but adds that “no known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.” Nevertheless, proof-of-concept code for similar ICS flaws often appears quickly, and defenders should assume active development is underway.

Mitigations: Patch, Isolate, and Harden

Delta’s primary fix is updating to COMMGR v2.10.0. All affected organizations should apply this patch as soon as possible. Beyond patching, the forum analysis and CISA recommend layered defenses that are especially important in OT environments where patch windows are infrequent.

Immediate Steps

  1. Patch COMMGR to v2.10.0: Download the update from Delta’s channels and deploy it in a controlled maintenance window. Validate the installation in a test environment first.
  2. Remove internet exposure: Block all inbound access to COMMGR services at the perimeter firewall. Use a zero-trust model: no engineering workstation should be directly reachable from the internet.
  3. Network segmentation: Place engineering workstations and COMMGR servers in a dedicated OT segment with strict traffic controls. Allow only necessary connections to management and control networks.
  4. Harden file handling: Configure email filters to block .isp attachments, enable sandboxing of project files, and restrict write access to shared repositories. Use signed project files and verify hashes before opening.
  5. Application whitelisting: On engineering hosts, allow only approved executables. This can prevent injected code from spawning child processes like PowerShell or cmd.exe.
  6. Enforce least privilege and MFA: Remove local admin rights from engineers’ daily accounts. Require multi-factor authentication for all remote access to OT systems.

Detection and Incident Response

SOC and OT monitoring teams should implement the following detection strategies immediately:

  • Process monitoring: Alert on COMMGR spawning unexpected child processes (e.g., PowerShell, wscript, or custom shells). Baselining normal behavior helps spot anomalies.
  • File access patterns: Monitor for unusual reads of .isp files from external or untrusted directories. Set up alerts for any attempt to open .isp files from email attachments or temporary folders.
  • Network traffic: Watch for outbound connections from engineering workstations to unfamiliar IP addresses, particularly over non-standard ports.
  • Log correlation: Integrate Windows event logs (Event ID 4688 for process creation, 5156 for Windows Filtering Platform) and EDR telemetry into a SIEM. Look for signs of command-line activity associated with exploitation.

If a compromise is suspected, isolate the affected workstation immediately, preserve forensic evidence, and initiate ICS-specific incident response procedures that prioritize safety and process continuity. CISA encourages organizations to report incidents promptly for correlation with other attacks.

The Bigger Picture: ICS Software as a Prime Target

These vulnerabilities underscore a persistent reality: industrial engineering software is a soft underbelly in critical infrastructure security. COMMGR is just one example of a tool that runs with elevated privileges on sensitive hosts, accepts files from diverse sources, and is often excluded from routine vulnerability management. As the forum analysis notes, “Engineering software is a critical attack surface in OT environments,” yet many organizations treat it as an afterthought.

Why Patching Alone Isn’t Enough

  • Backup and recovery images: Golden images and offline backups frequently contain vulnerable COMMGR binaries. Updating these assets now prevents reintroduction of the flaw during disaster recovery.
  • Social engineering remains the weakest link: The code-injection vulnerability requires user interaction, which puts a premium on security awareness training for engineers. They must treat unsolicited project files with the same suspicion as random email attachments.
  • Vendor scoring nuances: The CVSS v4 scores in the vendor advisory are self-calculated. While they align with independent CVSS v3.1 assessments, organizations should cross-reference scores with their own risk models and environmental vectors.

What to Watch For

  • Public exploit code: Given the straightforward file-parsing nature of these bugs, proof-of-concept code is likely to surface. Monitor repositories like GitHub, exploit-db, and threat intelligence feeds.
  • Additional Delta advisories: Delta and CISA may release updated guidance or detection signatures. Subscribe to ICS-CERT alerts and Delta’s security page.
  • Supply-chain abuse: Malicious .isp files could be injected into legitimate project repositories. Vet all incoming project files, even those from trusted partners.

Final Verdict

CVE-2025-53418 and CVE-2025-53419 present a clear and present danger to industrial control environments. The availability of a vendor patch (COMMGR v2.10.0) is the single most important remediation measure, but it must be paired with aggressive network segmentation, file hygiene, and continuous monitoring. CISA’s advisory and the detailed community analysis leave no room for ambiguity: these flaws can lead to full system compromise, and the attack surface extends well beyond directly internet-facing systems.

Engineers, IT security teams, and OT asset owners should treat this as a high-priority incident and act now. Patch, segment, and verify—the adversary is resourceful and the window of exposure is already open.