CVE-2021-31881

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

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303). When processing a DHCP OFFER message, the DHCP client application does not validate the length of the Vendor option(s), leading to Denial-of-Service conditions. (FSMD-2021-0008)

Affected (10)

Products: Siemens: Capital Vstar, Nucleus Net, Nucleus Readystart V3, Nucleus Source Code, Apogee Modular Building Controller Firmware, Apogee Modular Equiment Controller Firmware, Apogee Pxc Compact Firmware, Apogee Pxc Modular Firmware, Talon Tc Compact Firmware, Talon Tc Modular Firmware

Siemens

10 products

Capital Vstar

Nucleus Net

Nucleus Readystart V3

Nucleus Source Code

Apogee Modular Building Controller Firmware

Apogee Modular Equiment Controller Firmware

Apogee Pxc Compact Firmware

Apogee Pxc Modular Firmware

Talon Tc Compact Firmware

Talon Tc Modular Firmware

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Siemens Capital Vstar	All versions
Siemens Nucleus Net	All versions
Siemens Nucleus Readystart V3	Before 2012.08
Siemens Nucleus Source Code	All versions

Configuration B

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Siemens Apogee Modular Building Controller Firmware	All versions

Running on/with	Platform Versions
Siemens Apogee Modular Building Controller	All versions

Configuration C

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Siemens Apogee Modular Equiment Controller Firmware	All versions

Running on/with	Platform Versions
Siemens Apogee Modular Equiment Controller	All versions

Configuration D

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Siemens Apogee Pxc Compact Firmware	All versions

Running on/with	Platform Versions
Siemens Apogee Pxc Compact	All versions

Configuration E

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Siemens Apogee Pxc Modular Firmware	All versions

Running on/with	Platform Versions
Siemens Apogee Pxc Modular	All versions

Configuration F

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Siemens Talon Tc Compact Firmware	All versions

Running on/with	Platform Versions
Siemens Talon Tc Compact	All versions

Configuration G

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Siemens Talon Tc Modular Firmware	All versions

Running on/with	Platform Versions
Siemens Talon Tc Modular	All versions

Related CWEs

CWE-125

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.