BlackTreeIndependent security intelligence

Full vulnerability report · 2020

CVE-2020-7540High confidence

n/a Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions) — Missing Authentication for Critical Function

n/a · Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions)

9.8CriticalCVSS 3.1

Recommended action

Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available

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-2020-343-04 · CSAF 2.0 · revision 2.0.0 · finalSchneider Electric CPCERTWeb Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules

12 known affected

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

Schneider Electric Modicon M340 CPUs all versions prior to V3.30
Schneider Electric Modicon M340 Ethernet Communication modules BMXNOE0100 (H) all versions prior to V3.3
Schneider Electric Modicon M340 Ethernet Communication modules BMXNOE0110 (H) all versions prior to V6.5
Schneider Electric Modicon M340 Ethernet Communication modules BMXNOC0401 (H) all versions prior to V2.10
Schneider Electric Modicon Premium communication modules TSXETY4103 prior to V6.2
Schneider Electric Modicon Premium communication modules TSXETY4103 prior to V6.4
Schneider Electric Modicon Premium processors with integrated Ethernet COPRO versions prior to V6.1
Schneider Electric Modicon Quantum processors with integrated Ethernet COPRO 140CPU65xx0 prior to V6.1
Schneider Electric Modicon Quantum communication modules 140NOE771x1, prior to V7.1
Schneider Electric Modicon Quantum communication modules 140NOC78x00, prior to V1.74
Schneider Electric Modicon Quantum communication modules 140NOC77101, prior to V1.08
Schneider Electric Modicon X80 BMXNOR0200H RTU module BMXNOR0200H all versions prior to V1.70 IR 233

Summary: A CWE-306: Missing Authentication for Critical Function vulnerability exists that could cause unauthenticated command execution in the controller when sending special HTTP requests.
Remediation: Firmware V3.30 is available for all of the product references. Follow this link and find the right firmware file based on model used: https://www.se.com/ww/en/product-range/1468-modicon-m340/?parent-subcategory-id=3950

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-2020-28665

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 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available

What, why and how

A CWE-306: Missing Authentication for Critical Function vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions), that could cause unauthenticated command execution in the controller when sending special HTTP requests.

What

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

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 → Missing Authentication for Critical Function → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface: Network
Privileges required: None: unauthenticated exploitation is possible
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
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-306 ↗
CWE-306: Missing Authentication for Critical Function. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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:L/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.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.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.

NetworkUnauthenticatedCWE-306

Official authority intelligence

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

ENISA EUVD · EUVD-2020-28665Official EUVD mapping

0 linked advisory records.

Official EUVD record

CERT-FR · French · CERTFR-2020-AVI-801Multiples vulnérabilités dans les produits Schneider

De multiples vulnérabilités ont été découvertes dans les produits Schneider. Elles permettent à un attaquant de provoquer une exécution de code arbitraire, un déni de service à distance et une atteinte à la confidentialité des données.

Official advisory

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: Schneider Electric Modicon M340 CPUs all versions prior to V3.30; Schneider Electric Modicon M340 Ethernet Communication modules BMXNOE0100 (H) all versions prior to V3.3; Schneider Electric Modicon M340 Ethernet Communication modules BMXNOE0110 (H) all versions prior to V6.5; Schneider Electric Modicon M340 Ethernet Communication modules BMXNOC0401 (H) all versions prior to V2.10; Schneider Electric Modicon Premium communication modules TSXETY4103 prior to V6.2; Schneider Electric Modicon Premium communication modules TSXETY4103 prior to V6.4; Schneider Electric Modicon Premium processors with integrated Ethernet COPRO versions prior to V6.1; Schneider Electric Modicon Quantum processors with integrated Ethernet COPRO 140CPU65xx0 prior to V6.1; Schneider Electric Modicon Quantum communication modules 140NOE771x1, prior to V7.1; Schneider Electric Modicon Quantum communication modules 140NOC78x00, prior to V1.74; Schneider Electric Modicon Quantum communication modules 140NOC77101, prior to V1.08; Schneider Electric Modicon X80 BMXNOR0200H RTU module BMXNOR0200H all versions prior to V1.70 IR 233
Fixed: Schneider Electric Modicon M340 CPU 3.30; Schneider Electric Modicon M340 Ethernet Communication modules 3.3; Schneider Electric Modicon M340 Ethernet Communication modules 6.5; Schneider Electric Modicon M340 Ethernet Communication modules 2.10; Schneider Electric Modicon Premium communication modules 6.2; Schneider Electric Modicon Premium communication modules 6.4; Schneider Electric Modicon Premium processors with integrated Ethernet COPRO 6.1; Schneider Electric Modicon Quantum processors with integrated Ethernet COPRO 6.1; Schneider Electric Modicon Quantum communication 7.1; Schneider Electric Modicon Quantum communication 1.74; Schneider Electric Modicon Quantum communication 1.08; Schneider Electric Modicon X80 BMXNOR0200H RTU module 1.70 IR 23
Action: Firmware V3.30 is available for all of the product references. Follow this link and find the right firmware file based on model used: https://www.se.com/ww/en/product-range/1468-modicon-m340/?parent-subcategory-id=3950
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.

Evidence and provenance

Published 11 Dec 2020 · Last source change 4 Aug 2024, 09:33 UTC · CWE-306 · Missing Authentication for Critical Function

CVE recordCVE.org · 5.1

CVSS sourceNIST NVD

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-2020-28665

Product sourceVendor CSAF · Schneider Electric CPCERT

Remediation sourceVendor CSAF · Schneider Electric CPCERT

CWE sourceCNA

NVD statusNVD modified after enrichment

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

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

2020-12-11CVE published

ENISA EUVD · EUVD-2020-28665↗Vendor CSAF · Schneider Electric CPCERT↗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.