Apogee Pxc Modular Firmware CVE-2021-31344

MEDIUM

Access of Resource Using Incompatible Type (Type Confusion) (CWE-843)

2021-11-09 productcert@siemens.com

Information Disclosure Memory Corruption 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 Nucleus Readystart V4 Apogee Pxc Compact Firmware

6.9

CVSS 4.0 · Vendor: siemens

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Vulnerability Assessment

Weakness	CWE CWE-843 ASVS 5.0 V15 - Secure Coding and Architecture Type safety enforcement MITRE ATT&CK 1 technique across 1 tactic: Execution 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 6.9 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could execute arbitrary code by exploiting type confusion in the application by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 1.4% 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), PLUSCONTROL 1st Gen (All versions), SIMOTICS. Rated medium severity (CVSS 6.9), 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. Enforce strict type checking, use type-safe languages, validate object types before operations.

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Technical ContextAI · show details

This vulnerability is classified as Access of Resource Using Incompatible Type (Type Confusion) (CWE-843), which allows attackers to execute arbitrary code by exploiting type confusion in the application. 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 products include: Siemens Capital Vstar, Siemens Nucleus Net, Siemens Nucleus Readystart V3, Siemens Nucleus Readystart V4, Siemens Nucleus Source Code.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (siemens) PRIMARY 6.9 MEDIUM

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

Primary rating from Vendor (siemens) · only source for this CVE.

CVSS VectorVendor: siemens

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

None

Vulnerable system: Integrity

Low

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

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)

Threat Intelligence Overview

EPSS Score

1.4%

Top 30% 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 MEDIUM

CISA KEV No

Public POC No

EPSS 1.4%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

35

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +34

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

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)CVE.org

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_readystart_v4:*:*:*:*:*:*:*:*

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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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-223353.html REF https://cert-portal.siemens.com/productcert/html/ssa-620288.html REF https://cert-portal.siemens.com/productcert/html/ssa-845392.html REF https://cert-portal.siemens.com/productcert/pdf/ssa-223353.pdf REF https://cert-portal.siemens.com/productcert/pdf/ssa-620288.pdf REF https://cert-portal.siemens.com/productcert/pdf/ssa-845392.pdf

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