What is the CVSS score of CVE-2020-7562?

CVE-2020-7562 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. EPSS exploitation probability: 0.5%.

Modicon M340 Bmx Noc 0401 Firmware CVE-2020-7562

HIGH

Out-of-bounds Read (CWE-125)

2020-11-18 cybersecurity@se.com

Buffer Overflow Information Disclosure Schneider Electric Modicon M340 Bmx Noc 0401 Firmware Modicon M340 Bmx Noe 0100 Firmware Modicon M340 Bmx Noe 0100H Firmware Modicon M340 Bmx Noe 0110 Firmware Modicon M340 Bmx Noe 0110H Firmware Modicon M340 Bmx Nor 0200H Firmware Modicon M340 Bmx P34 2010 Firmware Modicon M340 Bmx P34 2030 Firmware Modicon Tsxety4103 Firmware Modicon Tsxety5103 Firmware Modicon Tsxp574634 Firmware Modicon Tsxp575634 Firmware Modicon Tsxp576634 Firmware Modicon Quantum 140Noe77101 Firmware Modicon Quantum 140Noe77111 Firmware Modicon Quantum 140Noc78100 Firmware Modicon Quantum 140Cpu65150 Firmware Modicon Quantum 140Cpu65150C Firmware Modicon Quantum 140Cpu65160C Firmware Modicon Quantum 140Cpu65160 Firmware

8.1

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 8.1 (HIGH). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 0.52%.
Exploit ScenarioDerived	A remote attacker could read data from memory outside the intended buffer boundaries by sending crafted requests to the affected application.

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

No patch listed yet 0.5% exploitation probability (EPSS)

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AnalysisAI

A CWE-125: Out-of-Bounds Read vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details). Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, 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

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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 CWE-125: Out-of-Bounds Read vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details) which could cause a segmentation fault or a buffer overflow when uploading a specially crafted file on the controller over FTP. Affected products include: Schneider-Electric Modicon Tsxety4103 Firmware, Schneider-Electric Modicon Tsxety5103 Firmware, Schneider-Electric Modicon Tsxp574634 Firmware, Schneider-Electric Modicon Tsxp575634 Firmware, Schneider-Electric Modicon Tsxp576634 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.1 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

DescriptionCVE.org

A CWE-125: Out-of-Bounds Read vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details) which could cause a segmentation fault or a buffer overflow when uploading a specially crafted file on the controller over FTP.

Threat Intelligence Overview

EPSS Score

0.5%

Top 33% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

VulDB

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 0.5%

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +40

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)CVE.org

cpe:2.3:o:schneider-electric:modicon_tsxety4103_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_tsxety5103_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_tsxp574634_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_tsxp575634_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_tsxp576634_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_quantum_140noe77101_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_quantum_140noe77111_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_quantum_140noc78100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65150_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65150c_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65160c_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65160_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_p34-2010_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_p34-2030_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_noc_0401_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0100h_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0110_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0110h_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:schneider-electric:modicon_m340_bmx_nor_0200h_firmware:*:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://vuldb.com/vuln/165091 ADVISORY https://www.se.com/ww/en/download/document/SEVD-2020-315-01/

Search Externally

GitHub PoC

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