Stack-Based Buffer Overflow in APOGEE Building Control Systems

CVE-2026-102076 is a stack-based buffer overflow vulnerability (CWE-121) affecting Johnson Controls' APOGEE building automation control systems across multiple platforms and communication protocols. With a CVSS score of 7.5, this high-severity flaw impacts critical infrastructure responsible for HVAC, lighting, and facility management in commercial buildings. The vulnerability spans MBC, MEC, PXC Compact, PXC Modular, and TALON TC controllers running BACnet and P2 Ethernet protocols—meaning numerous deployed systems remain vulnerable across all versions or versions prior to specific patches. Building automation systems are foundational to operational technology environments, and compromise could lead to facility disruption, unauthorized environmental control, or pivot points for broader infrastructure attacks.

While this CVE currently shows no mapped MITRE ATT&CK techniques and zero matching Casky skills, practitioners using Casky.ai with Claude's extended reasoning capabilities would benefit from the platform's ability to infer attack patterns around stack-based buffer overflows in OT/ICS contexts. Casky's 754 security skills, combined with Claude's reasoning engine, can help defenders model how stack overflow exploitation typically chains with techniques like Initial Access (T1200), Execution (T1203), and Persistence mechanisms common in building control compromise scenarios. When integrated with network telemetry and protocol analysis, practitioners would identify suspicious BACnet or P2 Ethernet traffic patterns, malformed packet structures, or controller behavior anomalies that signal exploitation attempts—enabling detection before the vulnerability is weaponized in active campaigns.