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CVE-2021-31885

HIGH
7.5
CVSS Score
Published: November 9, 2021 at 11:31 AM UTC
Updated: June 17, 2026 at 03:52 AM UTC
38 products affected across 1 vendorNucleus Source CodeNucleus NETNucleus ReadyStart V3

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

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 ReadyStart V4 (All versions < V4.1.1), Nucleus Source Code (All versions), PLUSCONTROL 1st Gen (All versions), TALON TC Compact (BACnet) (All versions < V3.5.4), TALON TC Modular (BACnet) (All versions < V3.5.4). TFTP server application allows for reading the contents of the TFTP memory buffer via sending malformed TFTP commands. (FSMD-2021-0009)

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%
All versions
siemens-apogee-pxc-compact (same device)
Apogee Pxc Modular Firmware· Siemens
95%
All versions
siemens-apogee-pxc-modular (same device)
Capital VSTAR· Siemens
95%
All versions
Nucleus NET· Siemens
95%
All versions
Nucleus ReadyStart V3· Siemens
95%
v < 2017.02.4All versions < V2017.02.4
Affected range stops below 2017.02.4, so it looks safe — our inference, not a vendor statement
Nucleus ReadyStart V4· Siemens
95%
v < 4.1.1All versions < V4.1.1
Affected range stops below 4.1.1, so it looks safe — our inference, not a vendor statement
Nucleus Source Code· Siemens
95%
All versions
Talon Tc Compact Firmware· Siemens
95%
All versions
siemens-talon-tc-compact (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 (3)

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
x_refsource_MISC
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-845392.pdf

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-805

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