CVE-2026-102075 in APOGEE MBC
Summary
by MITRE • 10/13/2026
A vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BACnet) (All versions), APOGEE MEC (PPC) (P2 Ethernet) (All versions), APOGEE PXC Compact (BACnet) (All versions < V3.5.7), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.21), APOGEE PXC Modular (BACnet) (All versions < V3.5.7), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.21), TALON TC Compact (BACnet) (All versions < V3.5.7), TALON TC Modular (BACnet) (All versions < V3.5.7). The affected product web service does not properly validate user input in multipart handling. This could allow an unauthenticated remote attacker to cause a denial of service.
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Analysis
by VulDB Data Team • 10/13/2026
The identified vulnerability resides within the embedded web services of several Honeywell APOGEE and TALON building automation system controllers, specifically affecting devices utilizing BACnet or P2 Ethernet protocols across various firmware versions. This security flaw is rooted in improper input validation during the handling of multipart form data requests sent to the device's management interface. Multipart encoding is a standard method for transmitting files and complex data structures over HTTP, commonly used when uploading configuration files, logs, or media through web-based administrative panels. The vulnerability arises because the underlying software component responsible for parsing these multipart payloads fails to adequately sanitize or validate the length, structure, or content of incoming fields before processing them. This lack of rigorous validation creates a pathway for an unauthenticated remote attacker to exploit the system by crafting maliciously formatted HTTP requests that trigger resource exhaustion conditions within the device's web server process.
From a technical perspective, this flaw is classified under CWE-20 Improper Input Validation and aligns with ATT&CK technique T1496 Resource Hijacking or potentially T1499 Endpoint Denial of Service depending on the specific mechanism of failure. When an attacker submits oversized fields, malformed boundary markers, or excessively nested multipart structures, the device's processor may enter a loop or consume excessive memory and CPU cycles while attempting to parse the invalid data. Since these controllers are often deployed in critical infrastructure environments such as commercial buildings, hospitals, and industrial facilities, they typically operate with limited computational resources compared to standard servers. Consequently, even moderately sized malformed requests can overwhelm the device's capacity to handle concurrent connections or process legitimate management traffic effectively. The absence of authentication requirements for this specific endpoint significantly lowers the barrier to entry for attackers, allowing anyone with network access to the subnet where these devices reside to initiate the attack without needing valid credentials.
The operational impact of this vulnerability is primarily a denial of service against the affected building automation systems. By exploiting this input validation flaw, an attacker can cause the web management interface to become unresponsive or crash entirely, preventing facility managers from monitoring environmental controls, security systems, and energy usage metrics via the browser-based dashboard. In some cases, repeated exploitation might lead to a complete reboot of the controller if watchdog timers fail to recover the hung process, resulting in temporary loss of control over HVAC units, lighting, or access points managed by that specific node. While this vulnerability does not appear to allow for remote code execution or data exfiltration based on current reports, the disruption to operational visibility and control can have significant secondary effects. For instance, an attacker could use this denial-of-service capability as a distraction while attempting other physical intrusions, or simply cause discomfort and potential safety risks by disrupting climate control in sensitive environments during extreme weather conditions.
Mitigation strategies for this vulnerability involve both immediate technical controls and long-term architectural improvements. The most effective remediation is to apply the vendor-recommended firmware updates that address these specific version constraints: upgrading APOGEE PXC Compact, TALON TC Compact, and Modular variants to versions V3.5.7 or later, and updating APOGEE PXC Modular devices running P2 Ethernet protocols to version V2.8.21 or higher. For the APOGEE MBC and MEC series which are listed as affecting all versions, immediate patching may not be available from the vendor, necessitating compensating controls. Network segmentation is critical; administrators should ensure that the management interfaces of these devices are isolated in a dedicated VLAN accessible only to authorized administrative workstations rather than being exposed on general corporate or guest networks. Additionally, implementing strict rate limiting and payload size restrictions at the network perimeter using firewalls or intrusion prevention systems can help mitigate the impact by blocking excessively large HTTP requests before they reach the vulnerable device logic until patches are applied.