CVE-2021-31882

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

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303). The DHCP client application does not validate the length of the Domain Name Server IP option(s) (0x06) when processing DHCP ACK packets. This may lead to Denial-of-Service conditions. (FSMD-2021-0011)

Affected

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

All versions
siemens-apogee-modular-building-controller (same device)
All versions
siemens-apogee-modular-equiment-controller (same device)
All versions
siemens-apogee-pxc-compact (same device)
All versions
siemens-apogee-pxc-modular (same device)
All versions
v < 2017.02.1
Affected range stops below 2017.02.1, so it looks safe — our inference, not a vendor statement
All versions
siemens-talon-tc-compact (same device)
All versions
siemens-talon-tc-modular (same device)

Remediation

No guide yet

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

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119

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