Apogee Pxc Modular Firmware CVE-2021-31881

HIGH

Out-of-bounds Read (CWE-125)

2021-11-09 productcert@siemens.com

Buffer Overflow Information Disclosure Siemens Apogee Pxc Modular Firmware Talon Tc Compact Firmware Talon Tc Modular Firmware Capital Vstar Nucleus Net Nucleus Source Code Apogee Modular Equiment Controller Firmware Apogee Modular Building Controller Firmware Nucleus Readystart V3 Apogee Pxc Compact Firmware

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-125 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, read limits MITRE ATT&CK 1 technique across 1 tactic: Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could read data from memory outside the intended buffer boundaries by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 1.5% exploitation probability (EPSS)

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AnalysisAI

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303). Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate array indices and buffer lengths. Use memory-safe languages. Enable AddressSanitizer during testing.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Out-of-bounds Read (CWE-125), which allows attackers to read data from memory outside the intended buffer boundaries. 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 products include: Siemens Capital Vstar, Siemens Nucleus Net, Siemens Nucleus Readystart V3, Siemens Nucleus Source Code, Siemens Apogee Modular Building Controller Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

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)

Threat Intelligence Overview

EPSS Score

1.5%

Top 29% exploitable

Data Quality

2 sources

Confidence: Low

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 1.5%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

39

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:siemens:capital_vstar:*:*:*:*:*:*:*:*

cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:*

cpe:2.3:a:siemens:nucleus_readystart_v3:*:*:*:*:*:*:*:*

cpe:2.3:a:siemens:nucleus_source_code:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:apogee_modular_building_controller_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:apogee_modular_equiment_controller_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:apogee_pxc_compact_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:apogee_pxc_modular_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:talon_tc_compact_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:talon_tc_modular_firmware:*:*:*:*:*:*:*:*

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Same weakness CWE-125 – Out-of-bounds Read

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CVE-2014-0160 HIGH POC

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CVE-2016-1646 HIGH POC

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CVE-2016-4523 HIGH

CVE-2024-48456 HIGH POC

CVE-2024-48457 HIGH POC

Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC

CVE-2015-5119 CRITICAL POC

CVE-2015-3113 CRITICAL POC

CVE-2011-2462 CRITICAL POC

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CVE-2019-11043 CRITICAL POC

CVE-2009-0927 HIGH POC

CVE-2012-1889 HIGH POC

References

Advisories & patches

ADVISORY https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf ADVISORY https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf REF https://cert-portal.siemens.com/productcert/html/ssa-044112.html REF https://cert-portal.siemens.com/productcert/html/ssa-114589.html REF https://cert-portal.siemens.com/productcert/html/ssa-620288.html REF https://cert-portal.siemens.com/productcert/pdf/ssa-620288.pdf

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