SSA-333035

Siemens Security Advisory by Siemens ProductCERT

SSA-333035: Multiple Vulnerabilities in APOGEE, TALON and Desigo PXC/PXM Products

Publication Date:	2026-10-13
Last Update:	2026-10-13
Current Version:	V1.0
CVSS v3.1 Base Score:	8.2
CVSS v4.0 Base Score:	8.8

SUMMARY

The products listed below contain multiple vulnerabilities that could allow an attacker to cause a denial of service and potentially impact the availability of the affected device.

Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens recommends specific mitigations for products where fixes are not or not yet available.

KNOWN AFFECTED PRODUCTS

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Affected Product and Versions	Remediation
APOGEE MBC (PPC) (BACnet) All versions affected by multiple CVEs CVE-2026-102075 CVE-2026-102076 CVE-2026-102074 CVE-2026-102073	Currently no fix is planned See further recommendations from section Mitigations
APOGEE MBC (PPC) (P2 Ethernet) All versions affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Currently no fix is planned See further recommendations from section Mitigations
APOGEE MEC (PPC) (BACnet) All versions affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Currently no fix is planned See further recommendations from section Mitigations
APOGEE MEC (PPC) (P2 Ethernet) All versions affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Currently no fix is planned See further recommendations from section Mitigations
APOGEE PXC Compact (BACnet) All versions < V3.5.7 affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Update to V3.5.7 or later version https://partnerportal.extranet.dc.siemens.com/ See further recommendations from section Mitigations
APOGEE PXC Compact (P2 Ethernet) All versions < V2.8.21 affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Update to V2.8.21 or later version https://partnerportal.extranet.dc.siemens.com/ See further recommendations from section Mitigations
APOGEE PXC Modular (BACnet) All versions < V3.5.7 affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Update to V3.5.7 or later version https://partnerportal.extranet.dc.siemens.com/ See further recommendations from section Mitigations
APOGEE PXC Modular (P2 Ethernet) All versions < V2.8.21 affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Update to V2.8.21 or later version https://partnerportal.extranet.dc.siemens.com/ See further recommendations from section Mitigations
Desigo PXC00-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC00-U All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC001-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC12-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC22-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC22.1-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC36.1-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC50-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC64-U All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC100-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC128-U All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXC200-E.D All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
Desigo PXM20-E All versions >= V2.3 affected by CVE-2026-89208	Currently no fix is planned See further recommendations from section Mitigations
TALON TC Compact (BACnet) All versions < V3.5.7 affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Update to V3.5.7 or later version https://partnerportal.extranet.dc.siemens.com/ See further recommendations from section Mitigations
TALON TC Modular (BACnet) All versions < V3.5.7 affected by multiple CVEs CVE-2026-102074 CVE-2026-102075 CVE-2026-102076 CVE-2026-102073	Update to V3.5.7 or later version https://partnerportal.extranet.dc.siemens.com/ See further recommendations from section Mitigations

MITIGATIONS

Siemens has identified the following specific mitigations that customers can apply to reduce the risk:

CVE-2026-102073

Disable the FTP/Web service (Note that the FTP/Web service is disabled by default on APOGEE, Desigo, and TALON products.)

CVE-2026-102074

Disable the FTP/Web service (Note that the FTP/Web service is disabled by default on APOGEE, Desigo, and TALON products.)

CVE-2026-102075

Disable the FTP/Web service (Note that the FTP/Web service is disabled by default on APOGEE, Desigo, and TALON products.)

CVE-2026-102076

Disable the FTP/Web service (Note that the FTP/Web service is disabled by default on APOGEE, Desigo, and TALON products.)

CVE-2026-89208
- Apply network segmentation and put the controllers behind properly configured gateways/firewalls.

Product-specific remediations or mitigations can be found in the section Known Affected Products.
Please follow the General Security Recommendations.

GENERAL SECURITY RECOMMENDATIONS

As a general security measure Siemens strongly recommends to protect network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.

PRODUCT DESCRIPTION

APOGEE MEC (Modular Equipement Controller), MBC (Modular Building Controller), and PXC devices are Direct Digital Control (DDC) devices and an integral part of the APOGEE Automation System. These are legacy devices, replaced by the APOGEE PXC Modular and Compact Series.

APOGEE PXC Modular and Compact Series devices are high-performance Direct Digital Control (DDC) devices and an integral part of the APOGEE Automation System.

Desigo PXC00-E.D: System controller BACnet/IP. Article No: BPZ:PXC00-E.D

Desigo PXC00/64/128-U are automation stations with P-bus and PPS2 connections.

Desigo PXC001-E.D: System controller for the integration of KNX, M-Bus, Modbus or SCL over BACnet/IP. Article No: S55372-C114

Desigo PXC100-E.D: Automation station BACnet/IP, with up to 200 data points. Article No: BPZ:PXC100-E.D

Desigo PXC12-E.D: Automation station with 12 data points and BACnet on IP. Article No: BPZ:PXC12-E.D

Desigo PXC200-E.D: Automation station BACnet/IP, with more than 200 data points. Article No: BPZ:PXC200-E.D

Desigo PXC22-E.D: Automation station with 22 data points and BACnet on IP. Article No: BPZ:PXC22-E.D

Desigo PXC22.1-E.D: Automation station with 22 data points, extendable and BACnet on IP. Article No: S55372-C119

Desigo PXC36.1-E.D: Automation station with 36 data points, extendable and BACnet on IP. Article No: S55372-C121

Desigo PXC50-E.D: Automation station BACnet/IP, with up to 80 data points. Article No: S55372-C110

Desigo PXM20-E: Operator unit with BACnet on IP. Article No: BPZ:PXM20-E

TALON TC Modular and Compact Series devices are high-performance Direct Digital Control (DDC) devices and an integral part of the TALON Automation System.

VULNERABILITY DESCRIPTION

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This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

Vulnerability CVE-2026-89208

The affected product does not properly validate input bounds before accessing packet data. This could allow an unauthenticated remote attacker to trigger memory reads outside the intended packet boundaries.

CVSS v3.1 Base Score	5.3
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0 Base Score	6.9
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE	CWE-125: Out-of-bounds Read

Vulnerability CVE-2026-102073

The affected product web service does not properly validate the length of user-controllable input. This could allow an unauthenticated remote attacker to read portions of device memory or to cause a denial-of-service condition.

CVSS v3.1 Base Score	8.2
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
CVSS v4.0 Base Score	8.8
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
CWE	CWE-191: Integer Underflow (Wrap or Wraparound)

Vulnerability CVE-2026-102074

The affected product FTP service does not properly validate the length of user-controllable input. This could allow an unauthenticated remote attacker to cause a denial of service.

CVSS v3.1 Base Score	7.5
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0 Base Score	8.7
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE	CWE-121: Stack-based Buffer Overflow

Vulnerability CVE-2026-102075

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.

CVSS v3.1 Base Score	7.5
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0 Base Score	8.7
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE	CWE-121: Stack-based Buffer Overflow

Vulnerability CVE-2026-102076

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.

CVSS v3.1 Base Score	7.5
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0 Base Score	8.7
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE	CWE-121: Stack-based Buffer Overflow

ACKNOWLEDGMENTS

Siemens thanks the following party for its efforts:

Stanislav Dashevskyi and Francesco La Spina from Forescout Technologies Inc. for coordinated disclosure

ADDITIONAL INFORMATION

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

HISTORY DATA

V1.0 (2026-10-13):

Publication Date

The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.