Siemens APOGEE MBC up to 3.5.6/2.8.20 Multipart denial of service

Summaryinfo

A vulnerability labeled as critical has been found in Siemens APOGEE MBC, APOGEE MEC, APOGEE PXC Compact, APOGEE PXC Modular, TALON TC Compact and TALON TC Modular up to 3.5.6/2.8.20. This affects an unknown part of the component Multipart Handler. Such manipulation leads to denial of service. This vulnerability is listed as CVE-2026-102075. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Siemens APOGEE MBC, APOGEE MEC, APOGEE PXC Compact, APOGEE PXC Modular, TALON TC Compact and TALON TC Modular up to 3.5.6/2.8.20. It has been rated as critical. Affected by this issue is an unknown part of the component Multipart Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

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.

The advisory is available at cert-portal.siemens.com. This vulnerability is handled as CVE-2026-102075 since 09/28/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/13/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 3.5.7 or 2.8.21 eliminates this vulnerability.

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Productinfo

Vendor

• Siemens

Name

• APOGEE MBC
• APOGEE MEC
• APOGEE PXC Compact
• APOGEE PXC Modular
• TALON TC Compact
• TALON TC Modular

Version

• 2.8.0
• 2.8.1
• 2.8.2
• 2.8.3
• 2.8.4
• 2.8.5
• 2.8.6
• 2.8.7
• 2.8.8
• 2.8.9
• 2.8.10
• 2.8.11
• 2.8.12
• 2.8.13
• 2.8.14
• 2.8.15
• 2.8.16
• 2.8.17
• 2.8.18
• 2.8.19
• 2.8.20
• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5
• 3.5.6

License

• commercial

Website

• Vendor: https://www.siemens.com/

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