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HIGH · 8.8

CVE-2021-31887

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)...

Vulnerability 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 < V3.5.4), 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)

CVSS Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
SiemensNucleus NetAll versions
SiemensNucleus Readystart V3< 2017.02.4
SiemensNucleus Source CodeAll versions
SiemensApogee Modular Building Controller FirmwareAll versions
SiemensApogee Modular Building Controller-
SiemensApogee Modular Equiment Controller FirmwareAll versions
SiemensApogee Modular Equiment Controller-
SiemensApogee Pxc Compact Firmware< 2.8.19
SiemensApogee Pxc Compact-
SiemensApogee Pxc Modular Firmware< 2.8.19
SiemensApogee Pxc Modular-
SiemensTalon Tc Compact Firmware< 3.5.4
SiemensTalon Tc Compact-
SiemensTalon Tc Modular Firmware< 3.5.4
SiemensTalon Tc Modular-
SiemensDesigo Pxc00-E.D Firmware>= 2.3, < 6.30.016
SiemensDesigo Pxc00-E.D-
SiemensDesigo Pxc00-U Firmware>= 2.3, < 6.30.016
SiemensDesigo Pxc00-U-
SiemensDesigo Pxc001-E.D Firmware>= 2.3, < 6.30.016

Related Weaknesses (CWE)

CWE-170CWE-787

References

FAQ

What is CVE-2021-31887?

CVE-2021-31887 is a vulnerability with a CVSS score of 8.8 (HIGH). 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)...

How severe is CVE-2021-31887?

CVE-2021-31887 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-31887?

Check the references section above for vendor advisories and patch information. Affected products include: Siemens Nucleus Net, Siemens Nucleus Readystart V3, Siemens Nucleus Source Code, Siemens Apogee Modular Building Controller Firmware, Siemens Apogee Modular Building Controller.