CVE-2026-12661 in FactoryTalk Historian Machine Edition
Summary
by MITRE • 09/01/2026
A denial-of-service security issue exists within FactoryTalk® Historian Machine Edition. A network adjacent attacker who is authenticated could send crafted requests to the web interface, resulting in buffer overflow conditions that may cause the device to crash and become unresponsive.
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Analysis
by VulDB Data Team • 09/01/2026
The vulnerability identified in Rockwell Automation's FactoryTalk Historian Machine Edition represents a critical security flaw within its embedded web server component. This specific issue is classified as a denial-of-service condition triggered by a buffer overflow error. The root cause lies in the improper handling of input data received through the web interface, where the application fails to adequately validate or bound-check user-supplied strings before copying them into fixed-size memory buffers. When an attacker sends specially crafted HTTP requests containing oversized or malformed payloads, the excess data overwrites adjacent memory locations on the stack or heap. This corruption disrupts the normal flow of execution and leads to a crash in the web server process, rendering the device unresponsive to legitimate administrative tasks and monitoring operations.
From a technical perspective, this vulnerability aligns with CWE-120 Buffer Overflow without bounds checking and CWE-400 Resource Exhaustion resulting from denial-of-service conditions. The attack vector is network adjacent, meaning an attacker must be on the same local area network or have direct IP connectivity to the target device. Crucially, the exploitation requires authentication, which implies that the adversary must possess valid credentials for the FactoryTalk Historian Machine Edition interface. This requirement significantly limits the scope of potential attackers compared to unauthenticated remote code execution vulnerabilities but still poses a severe risk within environments where insider threats or compromised credential sets are prevalent. The operational impact is primarily availability-related; once triggered, the service crash necessitates manual intervention or automatic restart mechanisms to restore functionality, leading to downtime in industrial monitoring and data logging processes that rely on this historian component.
In terms of threat modeling, this vulnerability maps to MITRE ATT&CK technique T1499 Endpoint Denial of Service, specifically under sub-techniques involving application exhaustion or resource consumption via crafted requests. While the immediate effect is a crash rather than persistent compromise, such instability can be leveraged as part of a broader attack chain. For instance, an attacker might use this denial-of-service capability to distract security operations teams while attempting other malicious activities on adjacent systems within the industrial control network. Furthermore, repeated crashes could degrade system reliability over time if automatic restarts are not configured or fail due to underlying memory corruption issues that persist beyond the initial crash event.
Mitigation strategies should focus on both immediate remediation and long-term architectural hardening. The primary defense is applying the vendor-provided security patch or software update that addresses the buffer overflow condition by implementing proper input validation, length checks, and safe string handling functions within the web server code. Until patches are applied, network segmentation becomes critical; administrators should restrict access to the FactoryTalk Historian Machine Edition management interface using firewalls or VLANs so that only authorized administrative workstations can reach it. Additionally, enforcing strong authentication policies with multi-factor authentication reduces the likelihood of credential compromise by external actors. Monitoring tools should be configured to detect unusual spikes in HTTP request volume or malformed packet patterns directed at port 80 or 443 associated with this service, allowing for rapid identification and blocking of potential exploitation attempts before they cause sustained outages.