critical
9.8
CWE
170 787 119
Advisory Published
Updated

CVE-2021-31886: Buffer Overflow

First published: Tue Nov 09 2021(Updated: )

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 < V3.5.4), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.4), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.19), Desigo PXC00-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC00-U (All versions >= V2.3 and < V6.30.016), Desigo PXC001-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC100-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC12-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC128-U (All versions >= V2.3 and < V6.30.016), Desigo PXC200-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC36.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC50-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC64-U (All versions >= V2.3 and < V6.30.016), Desigo PXM20-E (All versions >= V2.3 and < V6.30.016), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus Source Code (All versions), TALON TC Compact (BACnet) (All versions < V3.5.4), TALON TC Modular (BACnet) (All versions < V3.5.4). FTP server does not properly validate the length of the “USER” command, leading to stack-based buffer overflows. This may result in Denial-of-Service conditions and Remote Code Execution. (FSMD-2021-0010)

Credit: productcert@siemens.com

Affected SoftwareAffected VersionHow to fix
Siemens Nucleus NET
Siemens Nucleus ReadyStart v3<2017.02.4
Siemens Nucleus Source Code
Siemens Apogee Modular Building Controller Firmware
Siemens Apogee Modular Building Controller
Siemens Apogee Modular Equiment Controller Firmware
Siemens Apogee Modular Equiment Controller
Siemens Apogee Pxc Compact Firmware<2.8.19
Siemens Apogee Pxc Compact Firmware<3.5.4
Siemens Apogee Pxc Compact
Siemens Apogee Pxc Modular Firmware<2.8.19
Siemens Apogee Pxc Modular Firmware<3.5.4
Siemens Apogee Pxc Modular
Siemens Talon Tc Compact Firmware<3.5.4
Siemens Talon Tc Compact
Siemens Talon Tc Modular Firmware<3.5.4
Siemens Talon Tc Modular
Siemens Desigo Pxc00-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc00-e.d
Siemens Desigo Pxc00-u Firmware>=2.3<6.30.016
Siemens Desigo Pxc00-u
Siemens Desigo Pxc001-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc001-e.d
Siemens Desigo Pxc12-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc12-e.d
Siemens Desigo Pxc22-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc22-e.d
Siemens Desigo Pxc22.1-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc22.1-e.d
Siemens Desigo Pxc36.1-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc36.1-e.d
Siemens Desigo Pxc50-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc50-e.d
Siemens Desigo Pxc64-u Firmware>=2.3<6.30.016
Siemens Desigo Pxc64-u
Siemens Desigo Pxc100-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc100-e.d
Siemens Desigo Pxc128-u Firmware>=2.3<6.30.016
Siemens Desigo Pxc128-u
Siemens Desigo Pxc200-e.d Firmware>=2.3<6.30.016
Siemens Desigo Pxc200-e.d
Siemens Desigo Pxm20-e Firmware>=2.3<6.30.016
Siemens Desigo Pxm20-e

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-31886?

    The severity of CVE-2021-31886 is critical with a CVSS score of 9.8.

  • Which software versions are affected by CVE-2021-31886?

    CVE-2021-31886 affects all versions of APOGEE MBC (PPC) (BACnet) and APOGEE MBC (PPC) (P2 Ethernet).

  • How can I fix CVE-2021-31886?

    To fix CVE-2021-31886, it is recommended to update to version 3.5.4 or later of APOGEE PXC Compact firmware.

  • What is the Common Weakness Enumeration (CWE) for CVE-2021-31886?

    The CWEs associated with CVE-2021-31886 are CWE-119, CWE-170, and CWE-787.

  • Where can I find more information about CVE-2021-31886?

    More information about CVE-2021-31886 can be found in the Siemens ProductCERT advisories: [SSA-044112](https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf) and [SSA-114589](https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf).

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