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CVE-2021-31887

HIGH
8.8
CVSS Score
Published: November 9, 2021 at 11:32 AM UTC
Updated: June 17, 2026 at 03:52 AM UTC
48 products affected across 1 vendorNucleus Source CodeNucleus NETNucleus ReadyStart V3

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Severity
HIGH8.8
Exploit prediction
EPSS 2%

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)

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Apogee Modular Building Controller Firmware· Siemens
95%
All versions
siemens-apogee-modular-building-controller (same device)
Apogee Modular Equiment Controller Firmware· Siemens
95%
All versions
siemens-apogee-modular-equiment-controller (same device)
Apogee Pxc Compact Firmware· Siemens
95%
v < 2.8.19v < 3.5.4
Affected range stops below 2.8.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.5.4, so it looks safe — our inference, not a vendor statement
siemens-apogee-pxc-compact (same device)
Apogee Pxc Modular Firmware· Siemens
95%
v < 2.8.19v < 3.5.4
Affected range stops below 2.8.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.5.4, so it looks safe — our inference, not a vendor statement
siemens-apogee-pxc-modular (same device)
Desigo Pxc00-e.d Firmware· Siemens
95%
2.3 ≤ v < 6.30.016
Affected range stops below 6.30.016, so it looks safe — our inference, not a vendor statement
siemens-desigo-pxc00-e-d (same device)
Desigo Pxc00-u Firmware· Siemens
95%
2.3 ≤ v < 6.30.016
Affected range stops below 6.30.016, so it looks safe — our inference, not a vendor statement
siemens-desigo-pxc00-u (same device)
Desigo Pxc001-e.d Firmware· Siemens
95%
2.3 ≤ v < 6.30.016
Affected range stops below 6.30.016, so it looks safe — our inference, not a vendor statement
siemens-desigo-pxc001-e-d (same device)
Desigo Pxc100-e.d Firmware· Siemens
95%
2.3 ≤ v < 6.30.016
Affected range stops below 6.30.016, so it looks safe — our inference, not a vendor statement
siemens-desigo-pxc100-e-d (same device)
Desigo Pxc12-e.d Firmware· Siemens
95%
2.3 ≤ v < 6.30.016
Affected range stops below 6.30.016, so it looks safe — our inference, not a vendor statement
siemens-desigo-pxc12-e-d (same device)
Desigo Pxc128-u Firmware· Siemens
95%
2.3 ≤ v < 6.30.016
Affected range stops below 6.30.016, so it looks safe — our inference, not a vendor statement
siemens-desigo-pxc128-u (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf
x_refsource_MISCVendor Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-170CWE-787

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