CVE record · CVE-2021-31888

Improper null termination in Siemens APOGEE MBC (PPC) (BACnet) and others

No CVSS scoreEPSS 0.024 · 84th percentile

Published by the CVE Program (CNA: siemens) at 9 Nov 2021, 11:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Siemens	APOGEE MBC (PPC) (BACnet)	affected All versions
Siemens	APOGEE MBC (PPC) (P2 Ethernet)	affected All versions
Siemens	APOGEE MEC (PPC) (BACnet)	affected All versions
Siemens	APOGEE MEC (PPC) (P2 Ethernet)	affected All versions
Siemens	APOGEE PXC Compact (BACnet)	affected All versions < V3.5.4
Siemens	APOGEE PXC Compact (P2 Ethernet)	affected All versions < V2.8.19
Siemens	APOGEE PXC Modular (BACnet)	affected All versions < V3.5.4
Siemens	APOGEE PXC Modular (P2 Ethernet)	affected All versions < V2.8.19
Siemens	Desigo PXC00-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC00-U	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC001-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC100-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC12-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC128-U	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC200-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC22-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC22.1-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC36.1-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC50-E.D	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXC64-U	affected All versions >= V2.3 and < V6.30.016
Siemens	Desigo PXM20-E	affected All versions >= V2.3 and < V6.30.016
Siemens	Nucleus NET	affected All versions
Siemens	Nucleus ReadyStart V3	affected All versions < V2017.02.4
Siemens	Nucleus Source Code	affected All versions
Siemens	TALON TC Compact (BACnet)	affected All versions < V3.5.4
Siemens	TALON TC Modular (BACnet)	affected All versions < V3.5.4

Identifiers: CVE-2021-31888
CNA: siemens
Weakness (CWE): CWE-170
Tags: 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)
CWE-170
Published: 9 Nov 2021
Updated: 3 Aug 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

No source has published a CVSS score for this record yet.

CISA KEV Not listed.
EPSS 0.024, the 84th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 9 Nov 2021. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.