CVE-2025-64691
Published: 16 January 2026
Summary
CVE-2025-64691 is a critical-severity Code Injection (CWE-94) vulnerability in Aveva Process Optimization. Its CVSS base score is 9.3 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 20.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 CM-5 (Access Restrictions for Change) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-64691, published on 2026-01-16, is a high-severity vulnerability (CVSS 8.8, CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) classified as CWE-94 (code injection). It affects the model application server in AVEVA software, enabling an authenticated OS standard user to tamper with TCL Macro scripts.
An authenticated attacker with OS standard user privileges can exploit this vulnerability locally with low complexity and no user interaction. Successful exploitation allows privilege escalation to OS system level, potentially resulting in complete compromise of the model application server.
Advisories from CISA (ICSA-26-015-01) and AVEVA provide mitigation guidance, including patches available via AVEVA's software support downloads and cybersecurity updates pages.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2994
Vulnerability details
The vulnerability, if exploited, could allow an authenticated miscreant (OS standard user) to tamper with TCL Macro scripts and escalate privileges to OS system, potentially resulting in complete compromise of the model application server.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Local code injection into TCL macros directly enables exploitation for privilege escalation from standard user to system level.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Timely application of vendor patches directly remediates the code injection flaw in TCL Macro scripts, preventing privilege escalation exploitation.
Restricting change access to configuration-controlled components like TCL Macro scripts prevents authenticated standard users from tampering with them.
Enforcing least privilege on standard user accounts limits the scope and impact of potential privilege escalation from script tampering.