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CVE-2021-31344

MEDIUM
5.3
CVSS Score
Published: November 9, 2021 at 11:31 AM UTC
Updated: June 17, 2026 at 03:51 AM UTC
20 products affected across 1 vendorNucleus NETNucleus Source CodeNucleus ReadyStart V3

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%

Description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), SIMOTICS CONNECT 400 (All versions < V1.0.0.0). ICMP echo packets with fake IP options allow sending ICMP echo reply messages to arbitrary hosts on the network. (FSMD-2021-0004)

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 < 2017.02.1
Affected range stops below 2017.02.1, so it looks safe — our inference, not a vendor statement
Nucleus ReadyStart V4· Siemens
95%
v < 4.1.1
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 (10)

Source: [email protected]
https://cert-portal.siemens.com/productcert/html/ssa-044112.html
Source: [email protected]
https://cert-portal.siemens.com/productcert/html/ssa-114589.html
Source: [email protected]
https://cert-portal.siemens.com/productcert/html/ssa-223353.html
Source: [email protected]
https://cert-portal.siemens.com/productcert/html/ssa-620288.html
Source: [email protected]
https://cert-portal.siemens.com/productcert/html/ssa-845392.html
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-223353.pdf

CVSS

5.3MEDIUMsiemens
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-843

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