CVE-2026-27844 in Controller 6000
Summary
by MITRE • 07/07/2026
Uncaught Exception (CWE-248) in the Controller 6000 and Controller 7000 diagnostic web interface allows an authenticated and authorized operator to trigger a Controller restart by sending specific requests, resulting in a temporary denial of service. Version of Command Centre affected:
* 9.50 prior to vCR9.50.260616a (distributed in 9.50.1587(MR1)) * 9.40 prior to vCR9.40.260616a (distributed in 9.40.3130(MR3)) * 9.30 prior to vCR9.30.260616a (distributed in 9.30.3983(MR5)) * 9.20 prior to vCR9.20.260616a (distributed in 9.20.4349(MR7)) * all versions of 9.10 and prior.
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Analysis
by VulDB Data Team • 07/07/2026
This vulnerability represents an uncaught exception condition that manifests within the diagnostic web interface of Controller 6000 and Controller 7000 systems, classified under CWE-248 which specifically addresses uncaught exceptions in software applications. The flaw occurs when authenticated operators interact with the diagnostic interface through carefully crafted requests that trigger an application-level exception. This particular vulnerability exploits a fundamental weakness in error handling mechanisms where the system fails to properly manage exceptional conditions during request processing, leading to abrupt termination of the controller's operational state.
The technical implementation of this vulnerability involves the web interface receiving specific HTTP requests that contain malformed parameters or trigger edge cases within the controller's diagnostic routines. When these requests are processed, they cause the application to throw an unhandled exception that propagates through the system architecture without proper error recovery mechanisms. The controller's runtime environment responds to this unhandled exception by performing an automatic restart sequence, which serves as the primary impact mechanism for this vulnerability.
From an operational perspective, this vulnerability creates a temporary denial of service condition that significantly impacts system availability and reliability. The authenticated nature of the attack means that only authorized personnel with legitimate access credentials can exploit this weakness, but it still represents a serious security concern given that these individuals typically have elevated privileges within the system environment. The restart operation effectively removes the controller from service for an indeterminate period while the system reinitializes its operational state, potentially disrupting critical monitoring and control functions.
The affected versions span multiple major releases including 9.50, 9.40, 9.30, 9.20, and all versions of 9.10, indicating this represents a widespread issue across the product line that was not properly addressed in the respective release cycles. This vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks, specifically targeting system availability through controlled restart mechanisms. The exploitation requires minimal technical sophistication beyond understanding how to craft the specific requests needed to trigger the exception, making it particularly concerning from a security operations standpoint.
Organizations should implement immediate mitigations including applying the vendor-provided patches that address this specific uncaught exception handling issue in all affected versions of Command Centre software. Network segmentation and access controls should be reviewed to limit exposure of the diagnostic web interface to only necessary personnel with appropriate authorization levels. Additionally, monitoring systems should be configured to detect unusual restart patterns or unauthorized access attempts to the diagnostic interfaces, as these behaviors may indicate exploitation attempts.
The vulnerability demonstrates a critical gap in the application's defensive programming practices where proper exception handling mechanisms were not implemented to gracefully manage unexpected conditions during request processing. This represents a failure of the principle of least privilege and fail-safe design principles that should be inherent in industrial control systems. The presence of such vulnerabilities in production environments underscores the importance of robust software quality assurance processes and comprehensive security testing throughout the development lifecycle.
Security teams should prioritize remediation efforts for these affected versions while also conducting thorough assessments of similar applications within their infrastructure to identify potential uncaught exception scenarios that could lead to similar availability impacts. The vulnerability serves as a reminder of the critical need for proper error handling in mission-critical systems where unexpected behavior can lead to operational disruptions with potentially significant consequences.