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Modicon M340 Bmxp341000 Firmware CVE-2018-7761

CRITICAL
Improper Input Validation (CWE-20)
2018-04-18 cybersecurity@se.com
RCE Schneider Electric Modicon M340 Bmxp341000 Firmware Modicon M340 Bmxp342020 Firmware Tsxp574634M Firmware Tsxp575634M Firmware Tsxp576634M Firmware Modicon M340 Bmxp342020H Firmware Modicon M340 Bmxp3420302 Firmware Modicon M340 Bmxp3420302H Firmware Tsxp571634M Firmware Tsxp572634M Firmware Tsxp573634M Firmware Bmxnor0200H Firmware Modicon M340 Bmxp342000 Firmware Modicon M340 Bmxp3420102 Firmware Modicon M340 Bmxp3420102Cl Firmware Tsxh5744M Firmware Tsxh5724M Firmware Tsxp57554M Firmware Tsxp57454M Firmware Tsxp57304M Firmware Tsxp57254M Firmware Tsxp57204M Firmware Tsxp57154M Firmware Tsxp57104M Firmware 140Cpu65150 Firmware 140Cpu65160 Firmware 140Cpu65260 Firmware 140Cpu65860 Firmware 140Cpu65160S Firmware Modicon M340 Bmxp3420302Cl Firmware Tsxp57354M Firmware 140Cpu31110 Firmware 140Cpu43412U Firmware 140Cpu65150C Firmware 140Cpu31110C Firmware 140Cpu43412Uc Firmware 140Cpu65160C Firmware 140Cpu65260C Firmware 140Cpu65860C Firmware Bmxnor0200 Firmware Modicon M340 Bmxp341000H Firmware Tsxh5724Mc Firmware Tsxh5744Mc Firmware Tsxp57104Mc Firmware Tsxp57154Mc Firmware Tsxp571634Mc Firmware Tsxp57204Mc Firmware Tsxp57254Mc Firmware Tsxp572634Mc Firmware Tsxp57304Mc Firmware Tsxp57354Mc Firmware Tsxp573634Mc Firmware Tsxp57454Mc Firmware Tsxp574634Mc Firmware Tsxp57554Mc Firmware Tsxp575634Mc Firmware Tsxp576634Mc Firmware
9.8
CVSS 3.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 2.1% exploitation probability (EPSS)

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AnalysisAI

A vulnerability exists in the HTTP request parser in Schneider Electric's Modicon M340, Modicon Premium, Modicon Quantum PLC, BMXNOR0200 which could allow arbitrary code execution. Rated critical severity (CVSS 9.8), 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. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. A vulnerability exists in the HTTP request parser in Schneider Electric's Modicon M340, Modicon Premium, Modicon Quantum PLC, BMXNOR0200 which could allow arbitrary code execution. Affected products include: Schneider-Electric Bmxnor0200 Firmware, Schneider-Electric Bmxnor0200H Firmware, Schneider-Electric 140Cpu65150 Firmware, Schneider-Electric 140Cpu31110 Firmware, Schneider-Electric 140Cpu43412U Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
High
Integrity
High
Availability
High

DescriptionNVD

A vulnerability exists in the HTTP request parser in Schneider Electric's Modicon M340, Modicon Premium, Modicon Quantum PLC, BMXNOR0200 which could allow arbitrary code execution.

Threat Intelligence Overview

EPSS Score
2.1%
Top 20% exploitable
Data Quality
2 sources
Confidence: Low
NVD 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 CRITICAL
CISA KEV No
Public POC No
EPSS 2.1%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
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

51
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:o:schneider-electric:bmxnor0200_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:bmxnor0200h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65150_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu31110_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu43412u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65160_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65260_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65860_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65160s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65150c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu31110c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu43412uc_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65160c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65160c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65260c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65860c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmxp341000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmxp342000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102cl_firmware:-:*:*:*:*:*:*:*
+ 40 more

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Same weakness CWE-20 – Improper Input Validation

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CVE-2009-0927 HIGH POC
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CVE-2017-15944 CRITICAL POC
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CVE-2019-0604 CRITICAL POC
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Same technique RCE

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References

Advisories & patches
ADVISORY https://www.schneider-electric.com/en/download/document/SEVD-2018-081-02/

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