CVE-2021-31887

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)

Categories

8.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.72% Top 20%
Vendor Advisory siemens.com Vendor Advisory siemens.com
Affected: Siemens APOGEE MBC (PPC) (BACnet)
Affected: Siemens APOGEE MBC (PPC) (P2 Ethernet)
Affected: Siemens APOGEE MEC (PPC) (BACnet)
Affected: Siemens APOGEE MEC (PPC) (P2 Ethernet)
Affected: Siemens APOGEE PXC Compact (BACnet)
Affected: Siemens APOGEE PXC Compact (P2 Ethernet)
Affected: Siemens APOGEE PXC Modular (BACnet)
Affected: Siemens APOGEE PXC Modular (P2 Ethernet)
Affected: Siemens Desigo PXC00-E.D
Affected: Siemens Desigo PXC00-U
Affected: Siemens Desigo PXC001-E.D
Affected: Siemens Desigo PXC100-E.D
Affected: Siemens Desigo PXC12-E.D
Affected: Siemens Desigo PXC128-U
Affected: Siemens Desigo PXC200-E.D
Affected: Siemens Desigo PXC22-E.D
Affected: Siemens Desigo PXC22.1-E.D
Affected: Siemens Desigo PXC36.1-E.D
Affected: Siemens Desigo PXC50-E.D
Affected: Siemens Desigo PXC64-U
Affected: Siemens Desigo PXM20-E
Affected: Siemens Nucleus NET
Affected: Siemens Nucleus ReadyStart V3
Affected: Siemens Nucleus Source Code
Affected: Siemens TALON TC Compact (BACnet)
Affected: Siemens TALON TC Modular (BACnet)
Published at:
Updated at:

References

Link Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf vendor advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-31887?
CVE-2021-31887 has been scored as a high severity vulnerability.
How to fix CVE-2021-31887?
To fix CVE-2021-31887, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-31887 being actively exploited in the wild?
It is possible that CVE-2021-31887 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-31887?
CVE-2021-31887 affects Siemens APOGEE MBC (PPC) (BACnet), Siemens APOGEE MBC (PPC) (P2 Ethernet), Siemens APOGEE MEC (PPC) (BACnet), Siemens APOGEE MEC (PPC) (P2 Ethernet), Siemens APOGEE PXC Compact (BACnet), Siemens APOGEE PXC Compact (P2 Ethernet), Siemens APOGEE PXC Modular (BACnet), Siemens APOGEE PXC Modular (P2 Ethernet), Siemens Desigo PXC00-E.D, Siemens Desigo PXC00-U, Siemens Desigo PXC001-E.D, Siemens Desigo PXC100-E.D, Siemens Desigo PXC12-E.D, Siemens Desigo PXC128-U, Siemens Desigo PXC200-E.D, Siemens Desigo PXC22-E.D, Siemens Desigo PXC22.1-E.D, Siemens Desigo PXC36.1-E.D, Siemens Desigo PXC50-E.D, Siemens Desigo PXC64-U, Siemens Desigo PXM20-E, Siemens Nucleus NET, Siemens Nucleus ReadyStart V3, Siemens Nucleus Source Code, Siemens TALON TC Compact (BACnet), Siemens TALON TC Modular (BACnet).
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