CVE-2025-64729: Aveva Process Optimization Escalation Flaw

CVE-2025-64729 Overview

CVE-2025-64729 is a privilege escalation vulnerability affecting AVEVA Process Optimization software. The vulnerability allows an authenticated user with standard OS privileges to tamper with Process Optimization project files, embed malicious code, and escalate their privileges to the identity of a victim user who subsequently interacts with the compromised project files.

This vulnerability is classified as CWE-862 (Missing Authorization), indicating that the application fails to properly enforce authorization checks when handling project files. This allows attackers with local access to manipulate critical project data without appropriate permission validation.

Critical Impact

Authenticated attackers can escalate privileges by embedding malicious code in project files, potentially gaining access to privileged user accounts in industrial control system environments.

Affected Products

• AVEVA Process Optimization (all versions prior to patched release)

Discovery Timeline

• January 16, 2026 - CVE-2025-64729 published to NVD
• January 22, 2026 - Last updated in NVD database

Technical Details for CVE-2025-64729

Vulnerability Analysis

The vulnerability stems from a missing authorization flaw (CWE-862) in AVEVA Process Optimization software. When project files are accessed or modified, the application does not adequately verify that the requesting user has sufficient privileges to perform the action. This architectural weakness allows standard OS users to modify project files that should be protected from unauthorized changes.

The attack requires local access to the system and targets the trust relationship between users working with shared project files. When a higher-privileged user opens a tampered project file, any embedded malicious code executes with that user's privileges, effectively allowing the attacker to assume the victim's identity within the application context.

Industrial control system (ICS) environments are particularly vulnerable because project files are commonly shared between operators, engineers, and administrators with varying privilege levels. The impact extends to confidentiality, integrity, and availability of both the local system and potentially connected systems in the operational technology (OT) network.

Root Cause

The root cause of this vulnerability is insufficient authorization enforcement when handling project file operations. AVEVA Process Optimization fails to implement proper access controls that would prevent lower-privileged users from modifying project files or validate the integrity of project files before execution.

Specifically, the application lacks:

• Adequate permission checks on project file write operations
• Code signing or integrity verification for embedded code within project files
• Privilege separation between file modification and code execution contexts

Attack Vector

The attack vector for CVE-2025-64729 requires local access to a system running AVEVA Process Optimization. An attacker must first authenticate as a standard OS user, then locate and modify Process Optimization project files stored on the local file system or accessible network shares.

The attack sequence involves:

1. An authenticated attacker with standard user privileges identifies Process Optimization project files
2. The attacker modifies these files to embed malicious code or scripts
3. When a victim user with higher privileges opens the tampered project file, the embedded code executes
4. The malicious code runs with the victim's privileges, potentially allowing the attacker to perform unauthorized actions

This attack is particularly effective in environments where project files are shared among multiple users with different privilege levels, which is common in industrial process optimization workflows.

Detection Methods for CVE-2025-64729

Indicators of Compromise

• Unexpected modifications to Process Optimization project files, particularly by standard user accounts
• Changes to file timestamps or hashes of .prj or related project file extensions
• Unusual process spawning or script execution originating from the Process Optimization application
• Unexpected user privilege changes or access pattern anomalies in audit logs

Detection Strategies

• Implement file integrity monitoring (FIM) on all Process Optimization project file directories
• Configure audit logging to capture file modification events for project files, including the user account making changes
• Deploy endpoint detection and response (EDR) solutions to monitor for suspicious code execution originating from the Process Optimization application
• Enable Windows Security Event logging for file access events (Event ID 4663) on project file locations

Monitoring Recommendations

• Establish baseline behavior for project file access patterns and alert on deviations
• Monitor for privilege escalation attempts following project file modifications
• Review authentication logs for unusual access patterns to systems hosting Process Optimization
• Implement user behavior analytics (UBA) to detect anomalous file modification activities

How to Mitigate CVE-2025-64729

Immediate Actions Required

• Apply the latest security patch from AVEVA as documented in their Cyber Security Updates
• Restrict file system permissions on project file directories to limit which users can modify files
• Implement the principle of least privilege for all users accessing Process Optimization systems
• Segment networks to isolate Process Optimization systems from general corporate networks

Patch Information

AVEVA has released security updates to address this vulnerability. Organizations should download the patched version from the AVEVA Product Download portal. Additional guidance is available in the CISA ICS Advisory ICSA-26-015-01.

Workarounds

• Implement strict file system ACLs to prevent standard users from modifying project files
• Store project files on network shares with enforced access controls and audit logging
• Use separate user accounts for project file editing versus execution/review activities
• Enable application whitelisting to prevent unauthorized code execution from the Process Optimization context

# Example: Restrict project file directory permissions on Windows
# Run as Administrator to limit write access to project files

icacls "C:\AVEVA\ProcessOptimization\Projects" /inheritance:r
icacls "C:\AVEVA\ProcessOptimization\Projects" /grant:r "BUILTIN\Administrators:(OI)(CI)F"
icacls "C:\AVEVA\ProcessOptimization\Projects" /grant:r "AVEVA_ProjectEditors:(OI)(CI)M"
icacls "C:\AVEVA\ProcessOptimization\Projects" /grant:r "AVEVA_StandardUsers:(OI)(CI)R"