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Full vulnerability report · 2024
CVE-2023-6408High confidence

Schneider Electric Modicon M340 CPU (part numbers BMXP34*) — Improper Enforcement of Message Integrity During Transmission in a Communication Channel

Schneider Electric · Modicon M340 CPU (part numbers BMXP34*)

8.1HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.32% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Schneider Electric Modicon M340 CPU (part numbers BMXP34*) and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
SEVD-2024-044-01 · CSAF 2.0 · revision 5.0.0 · finalSchneider Electric CPCERTEcoStruxure™ Control Expert, EcoStruxure™ Process Expert and Modicon M340, M580 and M580 Safety PLCs
7 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • Modicon M340 CPU (part numbers BMXP34*) Versions prior to sv3.60
  • Modicon M580 CPU (part numbers BMEP* and BMEH* excluding M580 CPU Safety) Versions prior to sv4.20
  • Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Versions prior to SV4.21
  • EcoStruxure™ Control Expert Versions prior to v16.0
  • EcoStruxure™ Process Expert Versions prior to v2023
  • Firmware Versions prior to SV2.20 installed on Modicon MC80 (part numbers BMKC80) Controller
  • Modicon Momentum Unity M1E Processor Firmware Versions prior to SV2.90 installed on Modicon Momentum Unity M1E Processor Controller
Summary
A CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability exists that could cause a denial of service and loss of confidentiality, integrity of controllers when conducting a Man in the Middle attack.
Remediation
SV3.60 of Modicon M340 firmware includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product-range/1468- modicon-m340
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2023-58645

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability exists that could cause a denial of service and loss of confidentiality, integrity of controllers when conducting a Man in the Middle attack.

What

CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability exists that could cause a denial of service and loss of confidentiality, integrity of controllers when conducting a Man in the Middle attack.

Why

The product establishes a communication channel with an endpoint and receives a message from that endpoint, but it does not sufficiently ensure that the message was not modified during transmission.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability exists that could cause a denial of service and loss of confidentiality, integrity of controllers when conducting a Man in the Middle attack.

Why

The product establishes a communication channel with an endpoint and receives a message from that endpoint, but it does not sufficiently ensure that the message was not modified during transmission.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Enforcement of Message Integrity During Transmission in a Communication Channel → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-924 ↗

CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel. The product establishes a communication channel with an endpoint and receives a message from that endpoint, but it does not sufficiently ensure that the message was not modified during transmission.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-924
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

Cyber Security Agency of Singapore · English · CSA-SB-20240221Security Bulletin 21 Feb 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 21 Feb 2024, published on 21 February 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0120Multiples vulnérabilités dans les produits Schneider

De multiples vulnérabilités ont été découvertes dans les produits Schneider . Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-027969複数の Schneider Electric 製品における通信チャネルで送信中のメッセージの整合性への不適切な強制に関する脆弱性

Modicon M340 BMXP341000 ファームウェア、Modicon M340 BMXP341000H ファームウェア、Modicon M340 BMXP342000 ファームウェア等複数の Schneider Electric 製品には、通信チャネルで送信中のメッセージの整合性への不適切な強制に関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
SV3.60 of Modicon M340 firmware includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product-range/1468- modicon-m340
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 14 Feb 2024 · Last source change 2 Aug 2024, 08:28 UTC · CWE-924 · Improper Enforcement of Message Integrity During Transmission in a Communication Channel

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2023-58645
Product sourceVendor CSAF · Schneider Electric CPCERT
Remediation sourceVendor CSAF · Schneider Electric CPCERT
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    Versions prior to sv3.60; Versions prior to sv4.20; All Versions; Versions prior to v16.0; Versions prior to v2023 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Versions prior to sv3.60; Versions prior to sv4.20; All Versions; Versions prior to v16.0; Versions prior to v2023 · Fixed: SV3.60 of Modicon M340 firmware includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product-range/1468- modicon-m340
    Schneider Electric CPCERT ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Schneider Electric CPCERT ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    Modicon M340 CPU (part numbers BMXP34*) Versions prior to sv3.60; Modicon M580 CPU (part numbers BMEP* and BMEH* excluding M580 CPU Safety) Versions prior to sv4.20; Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Versions prior to SV4.21; EcoStruxure™ Control Expert Versions prior to v16.0; EcoStruxure™ Process Expert Versions prior to v2023; Modicon MC80 (part numbers BMKC80) All Versions; Modicon Momentum Unity M1E Processor Firmware Versions prior to SV2.90 installed on Modicon Momentum Unity M1E Processor Controller · Fixed: Modicon M340 CPU (part numbers BMXP34*) SV3.60; Modicon M580 CPU (part numbers BMEP* and BMEH*, excluding M580 CPU Safety) SV4.20; EcoStruxure™ Control Expert Version 16.0; EcoStruxure™ Process Expert Version 15.3 HF008; Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Version SV4.21; Modicon Momentum Unity M1E Processor Firmware Version SV2.90 installed on Modicon Momentum Unity M1E Processor Controller
    After
    Modicon M340 CPU (part numbers BMXP34*) Versions prior to sv3.60; Modicon M580 CPU (part numbers BMEP* and BMEH* excluding M580 CPU Safety) Versions prior to sv4.20; Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Versions prior to SV4.21; EcoStruxure™ Control Expert Versions prior to v16.0; EcoStruxure™ Process Expert Versions prior to v2023; Firmware Versions prior to SV2.20 installed on Modicon MC80 (part numbers BMKC80) Controller; Modicon Momentum Unity M1E Processor Firmware Versions prior to SV2.90 installed on Modicon Momentum Unity M1E Processor Controller · Fixed: Modicon M340 CPU (part numbers BMXP34*) SV3.60; Modicon M580 CPU (part numbers BMEP* and BMEH*, excluding M580 CPU Safety) SV4.20; EcoStruxure™ Control Expert Version 16.0; EcoStruxure™ Process Expert Version 15.3 HF008; Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Version SV4.21; Modicon Momentum Unity M1E Processor Firmware Version SV2.90 installed on Modicon Momentum Unity M1E Processor Controller; Firmware Version SV2.20 installed on Modicon MC80 (part numbers BMKC80) Controller
    Schneider Electric CPCERT ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2023-58645↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2023-6408 · cve.blacktree.nl