CVE-2025-7229 Overview
CVE-2025-7229 is an out-of-bounds write vulnerability [CWE-787] in INVT VT-Designer that allows attackers to execute arbitrary code on affected installations. The flaw resides in the parsing logic for PM3 files and stems from insufficient validation of user-supplied data. Successful exploitation requires user interaction: the target must open a crafted PM3 file or visit a malicious page that delivers one. Exploitation grants code execution in the context of the current process running VT-Designer. The Zero Day Initiative tracked the issue internally as ZDI-CAN-25722 and published advisory ZDI-25-480.
Critical Impact
Attackers can execute arbitrary code on engineering workstations running INVT VT-Designer by convincing an operator to open a malicious PM3 project file.
Affected Products
- INVT VT-Designer 2.1.13
- Earlier versions of INVT VT-Designer using the same PM3 parser
- Engineering workstations used to develop HMI projects for INVT devices
Discovery Timeline
- 2025-07-21 - CVE-2025-7229 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-7229
Vulnerability Analysis
INVT VT-Designer is HMI configuration software used to design and deploy operator panels for INVT industrial equipment. The application parses proprietary PM3 project files when an operator opens or imports a project. CVE-2025-7229 exists in this PM3 parsing path, where attacker-controlled fields drive a write operation beyond the bounds of an allocated buffer.
An out-of-bounds write [CWE-787] in a file parser typically allows an attacker to overwrite adjacent heap or stack data structures. By shaping the malicious PM3 file, an attacker can corrupt function pointers, vtable entries, or saved return addresses and redirect execution to attacker-controlled code. Because VT-Designer runs in the user's session, the resulting code executes with the privileges of the engineer opening the file. This commonly equates to administrative privileges on engineering workstations connected to industrial networks.
Root Cause
The root cause is the lack of proper validation of user-supplied length or offset values inside PM3 file structures. The parser trusts a size or index field from the file and uses it to write data into a fixed or undersized allocation. Without bounds checks, the write extends past the end of the destination structure and corrupts adjacent memory.
Attack Vector
The attack vector is local and requires user interaction. An attacker delivers a crafted PM3 file through email, a shared project repository, a removable drive, or a web page that triggers a download and prompt to open. When the engineer opens the file in VT-Designer, the malicious content triggers the out-of-bounds write and the embedded payload executes in process.
No proof-of-concept exploit is publicly available, and CVE-2025-7229 is not listed in the CISA Known Exploited Vulnerabilities catalog. Detailed mechanics are documented in the Zero Day Initiative Advisory ZDI-25-480.
Detection Methods for CVE-2025-7229
Indicators of Compromise
- Unexpected child processes spawned by VT-Designer.exe, particularly cmd.exe, powershell.exe, rundll32.exe, or regsvr32.exe.
- VT-Designer crashes or access violations recorded in Windows Event Logs immediately after a PM3 file is opened.
- PM3 files arriving from untrusted sources, email attachments, or external drives prior to a crash event.
- Outbound network connections initiated by the VT-Designer process to unrecognized destinations.
Detection Strategies
- Monitor process creation events where the parent is VT-Designer.exe and the child is a scripting or living-off-the-land binary.
- Alert on Windows Error Reporting (WerFault.exe) entries referencing VT-Designer, which often indicate parser exploitation attempts.
- Inspect file write and load events for PM3 files originating from email clients, browser download folders, or removable media.
Monitoring Recommendations
- Forward endpoint telemetry from engineering workstations to a central SIEM and retain process, file, and network events for forensic review.
- Apply application allowlisting and behavioral monitoring on operational technology (OT) engineering workstations where VT-Designer runs.
- Track inbound PM3 files through email and web proxy logs to identify potential delivery attempts.
How to Mitigate CVE-2025-7229
Immediate Actions Required
- Restrict opening of PM3 files to those received from verified internal sources and signed project repositories.
- Isolate engineering workstations running VT-Designer 2.1.13 from general-purpose internet and email access where feasible.
- Educate engineers and integrators about the risk of opening unsolicited PM3 project files.
- Review the Zero Day Initiative Advisory ZDI-25-480 and INVT vendor channels for fixed versions.
Patch Information
At the time of NVD publication, no vendor advisory URL was listed in the CVE record. Administrators should contact INVT support and monitor the Zero Day Initiative Advisory ZDI-25-480 for updated remediation guidance. Upgrade VT-Designer to the latest available release once INVT publishes a fixed build.
Workarounds
- Run VT-Designer under a standard user account rather than a local administrator to limit the impact of code execution.
- Block PM3 file attachments at the email gateway and web proxy until a patched version is deployed.
- Use file integrity controls and digital signatures to ensure only known-good PM3 projects are opened on engineering workstations.
- Enable operating system exploit mitigations such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) to raise the cost of successful exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
