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Introduction: A Silent but Severe Industrial Threat
Industrial control environments are designed for stability, safety, and predictability. When vulnerabilities surface in this space, the consequences extend far beyond data loss into physical operations, production continuity, and even human safety. On January 13, 2026, AVEVA confirmed a cluster of critical and high-severity security flaws in its widely deployed Process Optimization software, triggering urgent concern across the operational technology (OT) sector. These weaknesses, affecting all versions through 2024.1, allow attackers to fully compromise systems with little to no resistance.
Introduction: Why This Disclosure Matters Now
Unlike conventional IT software, Process Optimization platforms often run in trusted, segmented environments and control sensitive industrial workflows. The newly disclosed vulnerabilities break that trust model entirely, enabling remote attackers to execute code at the highest privilege level. With one flaw scoring the maximum possible CVSS rating, the disclosure represents one of the most severe OT security events reported this year.
Summary: AVEVA Confirms Seven Dangerous Vulnerabilities
AVEVA disclosed seven vulnerabilities ranging from high to critical severity in its Process Optimization product line. All affected versions include releases up to and including 2024.1. The most alarming issue allows unauthenticated attackers to execute remote code with SYSTEM-level privileges, effectively granting complete control over the Model Application Server.
Summary: Maximum-Severity Unauthenticated RCE
The most severe vulnerability, tracked as CVE-2025-61937, carries a CVSS score of 10.0. It abuses an exposed API endpoint that requires no authentication and no user interaction. By exploiting this flaw, an attacker can execute arbitrary code under the “taoimr” service context, immediately gaining SYSTEM privileges and full server compromise.
Summary: No User Interaction, No Barriers
What elevates this flaw into a top-tier threat category is the absence of exploitation barriers. No credentials are required, no phishing is involved, and no insider access is needed. Any attacker with network reachability to the affected service can weaponize the vulnerability, making it particularly dangerous for flat or improperly segmented industrial networks.
Summary: Three Additional Critical Exploitation Paths
Beyond the primary zero-day, AVEVA identified three additional critical vulnerabilities, each with a CVSS score of 9.3. While these require some level of authentication, they still enable rapid escalation to SYSTEM-level privileges once initial access is obtained.
Summary: TCL Macro Injection Escalation
CVE-2025-64691 allows authenticated users with basic operating system privileges to inject malicious TCL Macro scripts. These scripts execute within trusted Process Optimization workflows, enabling attackers to elevate privileges directly to SYSTEM without triggering conventional security alarms.
Summary: SQL Injection in Captive Historian
CVE-2025-61943 targets the Captive Historian component via a classic SQL injection flaw. Successful exploitation grants attackers SQL Server administrative privileges, which can then be chained into operating system-level code execution and persistent access.
Summary: DLL Hijacking for Privilege Escalation
CVE-2025-65118 exploits improper library loading behavior. Attackers can place a malicious DLL in a predictable location, causing Process Optimization services to load attacker-controlled code during execution, again resulting in privilege escalation.
Summary: High-Severity Flaws Expand Attack Surface
Three additional high-severity vulnerabilities broaden the attack landscape. While not immediately catastrophic on their own, they serve as powerful enablers when combined with other weaknesses or insider access.
Summary: Missing Authorization Controls
CVE-2025-64729 stems from missing access control lists on critical project files. This allows attackers to tamper with project data and escalate privileges through unauthorized modifications.
Summary: Malicious OLE Object Injection
CVE-2025-65117 permits authenticated designer users to embed malicious OLE objects into graphics files. When processed, these objects can trigger privilege escalation and arbitrary code execution.
Summary: Cleartext Communication Exposure
CVE-2025-64769 exposes sensitive data through unencrypted communication channels. This weakness enables man-in-the-middle attacks, credential harvesting, and traffic manipulation within industrial networks.
Summary: Confirmed Vulnerability Breakdown
CVE Vulnerability Type CVSS Score Severity
CVE-2025-61937 Remote Code Execution via API 10.0 Critical
CVE-2025-64691 Code Injection (TCL Macro) 9.3 Critical
CVE-2025-61943 SQL Injection 9.3 Critical
CVE-2025-65118 DLL Hijacking 9.3 Critical
CVE-2025-64729 Missing Authorization 8.6 High
CVE-2025-65117 Malicious OLE Objects 8.5 High
CVE-2025-64769 Cleartext Transmission 7.6 High
Summary: Vendor Mitigation Guidance
AVEVA strongly urges customers to upgrade immediately to Process Optimization 2025 or later. For organizations unable to patch right away, temporary mitigations include firewall restrictions on the “taoimr” service ports 8888 and 8889, tightening file system permissions, and enforcing strict project file handling procedures.
Summary: Coordinated and Validated Disclosure
The vulnerabilities were identified by security researcher Christopher Wu of Veracode during an AVEVA-sponsored penetration test. CISA coordinated CVE assignment and advisory publication, confirming the accuracy and severity of the findings.
What Undercode Say: OT Security Assumptions Are Breaking
The AVEVA disclosure highlights a systemic issue in industrial software design: excessive trust in internal services. Exposed APIs running with SYSTEM privileges represent a single point of catastrophic failure.
What Undercode Say: CVSS 10.0 Is Not Just a Number
A perfect CVSS score is rare, especially in OT products. It signals not only technical severity but also exploit practicality. In this case, exploitation requires minimal skill and no prior access, making it attractive to both criminal groups and nation-state actors.
What Undercode Say: The taoimr Service Is a Critical Weak Link
The fact that the “taoimr” service operates with SYSTEM privileges magnifies every flaw associated with it. Service hardening and privilege separation appear to have been insufficiently prioritized during development.
What Undercode Say: Authentication Is No Longer a Safety Net
Several vulnerabilities require authentication, but in OT environments, authenticated access is often easier to obtain than assumed. Shared credentials, legacy accounts, and contractor access weaken the effectiveness of authentication-based defenses.
What Undercode Say: Chaining Makes High-Severity Flaws Critical
High-severity issues like cleartext transmission and missing ACLs may seem secondary, but when chained with privilege escalation flaws, they accelerate full compromise timelines dramatically.
What Undercode Say: Industrial Networks Are Still Too Flat
Many Process Optimization deployments exist in flat networks with minimal segmentation. In such environments, an unauthenticated RCE instantly becomes a plant-wide incident rather than a localized breach.
What Undercode Say: Patch Latency Is the Real Enemy
OT environments are notorious for slow patch cycles. However, a 24–48 hour patch window is not a recommendation here—it is a survival requirement given the exploitability of CVE-2025-61937.
What Undercode Say: Temporary Mitigations Are Fragile
Firewall rules and access controls help, but they rely on perfect configuration and monitoring. One misconfigured rule can nullify all temporary defenses.
What Undercode Say: Penetration Testing Value Is Proven
This case reinforces the importance of continuous, vendor-sponsored penetration testing. Without it, these vulnerabilities could have remained undetected until exploited in the wild.
What Undercode Say: Regulatory Scrutiny Will Increase
With CISA involvement and critical infrastructure exposure, regulatory bodies are likely to scrutinize AVEVA deployments and customer patch compliance more aggressively.
What Undercode Say: Threat Actors Are Watching Closely
Public disclosure of a CVSS 10.0 OT vulnerability acts as a beacon for threat actors. Exploit development typically follows within days, not weeks.
What Undercode Say: Defense-in-Depth Must Be Enforced
Relying solely on vendor patches is no longer sufficient. Network segmentation, service isolation, and continuous monitoring must become baseline requirements for industrial software deployments.
What Undercode Say: This Is a Wake-Up Call for OT Vendors
Secure-by-design principles, least-privilege services, and hardened APIs must be standard, not optional, in industrial software moving forward.
Fact Checker Results
✅ AVEVA officially disclosed seven vulnerabilities affecting Process Optimization through version 2024.1
✅ CVE-2025-61937 carries a confirmed CVSS score of 10.0 with unauthenticated RCE
❌ No evidence currently confirms active exploitation in the wild at the time of disclosure
Prediction
🔮 Exploit code for the unauthenticated RCE will emerge publicly within days of disclosure
🔮 Industrial organizations will face increased regulatory pressure to prove patch compliance
🔮 Future AVEVA releases will shift toward stricter privilege separation and service hardening
🕵️📝✔️Let’s dive deep and fact‑check.
References:
Reported By: cyberpress.org
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