Source context: this article examines information published by the source on September 01, 2026. This site’s publication date is shown separately. Check the latest vendor guidance before acting.
What the vulnerability is
Two security flaws have been identified in Rockwell Automation Historian ME. The first, CVE-2025-12768, involves an out-of-bounds write condition that could allow an attacker with low-level authentication to achieve remote code execution on the affected device. The second, CVE-2026-12661, is a stack-based buffer overflow in the web interface; a network-adjacent authenticated attacker could send crafted requests to cause the device to crash and become unresponsive (denial-of-service).
Exposure and applicability
These vulnerabilities specifically affect the following versions of Rockwell Automation Historian ME:
* Series B 5.202
* Series C 7.101
This software is deployed within several critical infrastructure sectors, including Healthcare and Public Health. In a healthcare environment, historians are often used to collect and store time-series data from facility systems or medical equipment. A system crash or unauthorized code execution on these assets could disrupt the availability of operational data necessary for maintaining clinical environments or monitoring facility health.
Remediation priorities
Our analysis suggests that healthcare security leaders and clinical engineering teams prioritize the following actions based on their current environment:
- Software Updates: The primary remediation is to upgrade to corrected versions provided by Rockwell Automation. This addresses the root cause of both the out-of-bounds write and the buffer overflow.
- Network Isolation: For systems that cannot be immediately updated, we recommend isolating control system networks from general business networks using firewalls. This limits the ability of an attacker to reach the Historian ME web interface or authentication portals.
- Secure Remote Access: If remote access is required for maintenance, it should be routed through secure methods such as Virtual Private Networks (VPNs). However, organizations should ensure the VPN itself is updated and recognize that a VPN does not eliminate risks associated with the connected end-devices.
- Exposure Reduction: Minimize the network exposure of all control system devices to ensure they are not accessible from the public internet.
How to validate remediation
To verify that risk has been reduced, organizations should employ the following validation methods:
* Version Verification: Confirm through system logs or administrative consoles that Historian ME has been updated beyond Series B 5.202 and Series C 7.101.
* Network Path Analysis: Security teams can use authorized network mapping tools to verify that the affected devices are not reachable from the business network or the internet, confirming the effectiveness of firewall rules.
* Access Audit: Review authentication logs to ensure only authorized personnel have the low-level or high-level credentials required to interact with the Historian ME interface.
Limits and open questions
While updating software reduces the likelihood of exploitation, it does not guarantee total immunity from future flaws. Furthermore, while VPNs provide a layer of security for remote access, they may possess their own vulnerabilities and must be managed as part of a broader defense-in-depth strategy. Organizations should coordinate all updates and network changes with clinical engineering to ensure that patient care operations are not inadvertently disrupted during the remediation process.
Source and editorial note
Rockwell Automation Historian ME · Source date: September 01, 2026 · Retrieved September 01, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
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