CVE-2026-102076
Received Received - Intake

Buffer Overflow in Siemens APOGEE PXC Series

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: siemens-SADP

Description
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-supplied input in upload code. This could allow an unauthenticated remote attacker to cause a denial of service.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-102076
EUVD
EUVD-2026-98409

Affected Vendors & Products

Showing 10 associated CPEs
Vendor Product Version / Range
Siemens APOGEE MBC (PPC) (BACnet) 0
Siemens APOGEE MBC (PPC) (P2 Ethernet) 0
Siemens APOGEE MEC (PPC) (BACnet) 0
Siemens APOGEE MEC (PPC) (P2 Ethernet) 0
Siemens APOGEE PXC Compact (BACnet) 0
Siemens APOGEE PXC Compact (P2 Ethernet) 0
Siemens APOGEE PXC Modular (BACnet) 0
Siemens APOGEE PXC Modular (P2 Ethernet) 0
Siemens TALON TC Compact (BACnet) 0
Siemens TALON TC Modular (BACnet) 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

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Executive Summary

This vulnerability affects multiple Siemens building automation products. It involves improper input validation in the web service of affected devices. An unauthenticated remote attacker could exploit this to cause a denial of service by uploading specially crafted code.

Detection Guidance

This vulnerability involves improper input validation in the web service of affected products. Detection requires checking for unpatched versions of Siemens APOGEE and TALON devices. Monitor network traffic for unusual upload requests to BACnet or P2 Ethernet interfaces. Inspect device firmware versions against the specified vulnerable ranges.

Impact Analysis

If exploited, this vulnerability could disrupt building automation systems by causing them to stop functioning. This may lead to loss of control over heating, ventilation, air conditioning, or other critical building operations.

Compliance Impact

The vulnerability allows an unauthenticated remote attacker to cause a denial of service by exploiting improper input validation in the web service. This could disrupt critical building automation systems, potentially leading to unauthorized access or system unavailability. Such disruptions may impact compliance with standards like GDPR (data protection) or HIPAA (healthcare data) by compromising system integrity or availability.

Mitigation Strategies

Update affected Siemens APOGEE and TALON devices to versions specified in the CVE (PXC Compact/Modular < V3.5.7 for BACnet, < V2.8.21 for P2 Ethernet). Disable unauthenticated upload functionality if not required. Isolate affected systems from untrusted networks.

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