CVE-2025-12012 in Controller
Summary
by MITRE • 07/14/2026
A denial-of-service issue exists in 5380/5480/5580 controllers. This vulnerability could potentially allow a malicious user to write invalid file data to the controller, causing the device to enter a major non-recoverable fault (MNRF).
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical denial-of-service condition affecting controllers in the 5380/5480/5580 series, where improper input validation mechanisms fail to properly sanitize file data before processing. The flaw allows malicious actors to inject malformed or invalid file content directly into the controller's operational environment, creating a scenario where the device transitions into a major non-recoverable fault state that effectively renders the system inoperable. This type of vulnerability falls under CWE-129, Input Validation, and specifically manifests as a failure to properly validate data integrity before system processing. The vulnerability exploits weak validation routines that should normally filter out malformed inputs but instead permit them to propagate through the system's file handling mechanisms.
The operational impact of this vulnerability extends beyond simple service disruption, as the major non-recoverable fault condition represents a catastrophic failure state within the controller's fault management architecture. When the device enters MNRF, it typically requires complete system reset or physical intervention to restore functionality, creating significant downtime and potential safety concerns in industrial control environments. The attack vector involves direct manipulation of file data through legitimate write operations, making it particularly insidious as it can exploit existing administrative privileges or unauthorized access points to deliver malicious payloads. This vulnerability aligns with ATT&CK technique T1499.001 for Network Denial of Service and represents a critical weakness in the controller's defensive programming practices.
Mitigation strategies should focus on implementing robust input validation controls at multiple layers within the controller architecture, including file format verification, data integrity checks, and boundary condition testing before any file operations are executed. System administrators must enforce strict access controls and monitor file write operations to detect anomalous behavior patterns that could indicate exploitation attempts. The implementation of automated anomaly detection systems can help identify potential malicious file injections by monitoring for unusual data patterns or unauthorized modification sequences. Additionally, regular firmware updates should be deployed to address the underlying validation flaws, while network segmentation and privileged access controls can limit potential attack surfaces. Organizations should also consider implementing redundant control systems or fail-safe mechanisms that can automatically isolate compromised controllers during fault conditions, preventing cascading failures throughout complex industrial networks.