CVE-2021-31344

Name: CVE-2021-31344
Creator: NVD / NIST
Published: 2021-11-09T12:15:09.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 1.41%

Last modified Jun 17, 2026

CVE-2021-31344 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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. EPSS estimates a 1.41% chance of exploitation in the next 30 days.

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)

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS 4.0

6.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

1.41%

69.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Siemens	Capital Vstar	All versions
Siemens	Nucleus Net	All versions
Siemens	Nucleus Readystart V3	< 2017.02.1
Siemens	Nucleus Readystart V4	< 4.1.1
Siemens	Nucleus Source Code	All versions
Siemens	Apogee Modular Building Controller Firmware	All versions
Siemens	Apogee Modular Equiment Controller Firmware	All versions
Siemens	Apogee Pxc Compact Firmware	All versions
Siemens	Apogee Pxc Modular Firmware	All versions
Siemens	Talon Tc Compact Firmware	All versions
Siemens	Talon Tc Modular Firmware	All versions

References

Timeline

Published: Nov 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31344?

How severe is CVE-2021-31344?

CVE-2021-31344 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 1.41% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31344?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31344?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST