CVE-2021-31887 vulnerability in Siemens Products
Published on November 9, 2021

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 PWD/XPWD command, leading to stack-based buffer overflows. This may result in Denial-of-Service conditions and Remote Code Execution. (FSMD-2021-0016)

NVD

Weakness Type

Improper Null Termination

The software does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator. Null termination errors frequently occur in two different ways. An off-by-one error could cause a null to be written out of bounds, leading to an overflow. Or, a program could use a strncpy() function call incorrectly, which prevents a null terminator from being added at all. Other scenarios are possible.

Products Associated with CVE-2021-31887

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Siemens Capital Vstar

Siemens Nucleus Net

Siemens Nucleus Readystart V3

Siemens Nucleus Readystart V4

Siemens Nucleus Source Code

Affected Versions

Siemens APOGEE MBC (PPC) (BACnet):

Version All versions is affected.

Siemens APOGEE MBC (PPC) (P2 Ethernet):

Version All versions is affected.

Siemens APOGEE MEC (PPC) (BACnet):

Version All versions is affected.

Siemens APOGEE MEC (PPC) (P2 Ethernet):

Version All versions is affected.

Siemens APOGEE PXC Compact (BACnet):

Version All versions < V3.5.4 is affected.

Siemens APOGEE PXC Compact (P2 Ethernet):

Version All versions < V2.8.19 is affected.

Siemens APOGEE PXC Modular (BACnet):

Version All versions < V3.5.4 is affected.

Siemens APOGEE PXC Modular (P2 Ethernet):

Version All versions < V2.8.19 is affected.

Siemens Desigo PXC00-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC00-U:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC001-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC100-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC12-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC128-U:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC200-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC22-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC22.1-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC36.1-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC50-E.D:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXC64-U:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Desigo PXM20-E:

Version All versions >= V2.3 and < V6.30.016 is affected.

Siemens Nucleus NET:

Version All versions is affected.

Siemens Nucleus ReadyStart V3:

Version All versions < V2017.02.4 is affected.

Siemens Nucleus Source Code:

Version All versions is affected.

Siemens TALON TC Compact (BACnet):

Version All versions < V3.5.4 is affected.

Siemens TALON TC Modular (BACnet):

Version All versions < V3.5.4 is affected.

Exploit Probability

EPSS

1.72%

Percentile

82.13%