CVE-2025-64691

Summary

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.

Affected Software

Weaknesses

• CWE-94: CWE-94

Workarounds

AVEVA alternatively recommends the following actions users can take to mitigate risk:

• Apply host and/or network firewall rules restricting the taoimr service to accept traffic only from trusted source(s). By default, AVEVA Process Optimization listens on port 8888/8889(TLS). Please refer to the AVEVA Process Optimization Installation Guide for additional details on ports configuration.

• Apply ACLs to the installation and data folders, limiting write-access to trusted users only.

• Maintain a trusted chain-of-custody on Process Optimization project files during creation, modification, distribution, backups, and use.

For more information, please AVEVA's security bulletin AVEVA-2026-001 https://www.aveva.com/en/support-and-success/cyber-security-updates/ .

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://www.aveva.com/en/support-and-success/cyber-security-updates/
• https://softwaresupportsp.aveva.com/en-US/downloads/products/details/a643eaa3-0d85-4fde-ac11-5239e87a68ea
• https://www.cisa.gov/news-events/ics-advisories/icsa-26-015-01
• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-015-01.json

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