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Full vulnerability report · 2020
CVE-2020-7533High confidence

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests

n/a · Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see security notification for version information)

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-2020-287-01 · CSAF 2.0 · revision 1.1.0 · finalSchneider Electric CPCERTWeb Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules
11 known affected

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

  • Schneider Electric M340 CPUs BMX P34x prior to firmware version 3.20
  • Schneider Electric M340 Communication Ethernet modules BMX NOE 0100 (H) prior to version 3.3
  • Schneider Electric M340 Communication Ethernet modules BMX NOE 0110 (H) prior to version 6.5
  • Schneider Electric M340 Communication Ethernet modules BMX NOC 0401 prior to version 2.10
  • Schneider Electric Premium processors with integrated Ethernet COPRO TSXP574634, TSXP575634, TSXP576634 prior to 6.1 version
  • Schneider Electric Premium communication modules TSXETY4103 prior to version 6.2
  • Schneider Electric Premium communication modules TSXETY5103 prior to version 6.4
  • Schneider Electric Quantum processors with integrated Ethernet COPRO 140CPU65xxxxx prior to 6.1 version
  • Schneider Electric Quantum communication modules 140NOE771x1 prior to version 7.1
  • Schneider Electric Quantum communication modules 140NOC78x00 prior to version 1.74
  • Schneider Electric Quantum communication modules 140NOC77101 prior to version 1.08
Summary
CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.
Remediation
https://www.se.com/en/download/document/BMXP3420302_Firmwares/
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2020-28658

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
01

What, why and how

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.

What

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.

Why

The affected component does not establish the requesting party's identity reliably before granting access.

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

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.

Why

The affected component does not establish the requesting party's identity reliably before granting access.

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.

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 Authentication → 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-287 ↗

CWE-287: Improper Authentication. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

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-287
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2020-AVI-643Multiples vulnérabilités dans les produits Schneider Electric

De multiples vulnérabilités ont été découvertes dans les produits Schneider Electric. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service, un contournement de la politique de sécurité, une atteinte à l'intégrité des données, une atteinte à la confidentialité des données.

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
Schneider Electric M340 CPUs BMX P34x prior to firmware version 3.20; Schneider Electric M340 Communication Ethernet modules BMX NOE 0100 (H) prior to version 3.3; Schneider Electric M340 Communication Ethernet modules BMX NOE 0110 (H) prior to version 6.5; Schneider Electric M340 Communication Ethernet modules BMX NOC 0401 prior to version 2.10; Schneider Electric Premium processors with integrated Ethernet COPRO TSXP574634, TSXP575634, TSXP576634 prior to 6.1 version; Schneider Electric Premium communication modules TSXETY4103 prior to version 6.2; Schneider Electric Premium communication modules TSXETY5103 prior to version 6.4; Schneider Electric Quantum processors with integrated Ethernet COPRO 140CPU65xxxxx prior to 6.1 version; Schneider Electric Quantum communication modules 140NOE771x1 prior to version 7.1; Schneider Electric Quantum communication modules 140NOC78x00 prior to version 1.74; Schneider Electric Quantum communication modules 140NOC77101 prior to version 1.08
Fixed
Schneider Electric M340 BMXP3420302 and CL and H version 3.20; Schneider Electric M340 BMXP342020 and H version 3.20; Schneider Electric M340 BMXP342000 version 3.20; Schneider Electric M340 BMXP341000 and H version 3.20; Schneider Electric M340 BMXP3420102 and CL version 3.20; Schneider Electric M340 BMXP3420302 version 3.20; Schneider Electric M340 Communication Ethernet modules BMXNOE0100 and H version 3.3; Schneider Electric M340 Communication Ethernet modules BMXNOE0110 and H version 6.5; Schneider Electric M340 Communication Ethernet modules BMXNOC0401 version 2.10; Schneider Electric Premium Offers Premium processors with integrated Ethernet COPRO product references TSXP574634, TSXP575634, TSXP576634 version 6.1; Schneider Electric Premium Offers TSXETY4103 version 6.2; Schneider Electric Premium Offers TSXETY5103 version 6.4; Schneider Electric Quantum Offers Quantum processors with integrated Ethernet COPRO product reference 140CPU65xxxxx version 6.1; Schneider Electric Quantum Offers 140NOE771x1 version 7.1; Schneider Electric Quantum Offers 140NOC78x00 version 1.74; Schneider Electric Quantum Offers 140NOC77101 version 1.08
Action
https://www.se.com/en/download/document/BMXP3420302_Firmwares/
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 1 Dec 2020 · Last source change 10 Jun 2025, 08:02 UTC · CWE-287 · Improper Authentication

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-2020-28658
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.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2020-28658↗Vendor CSAF · Schneider Electric CPCERT↗Vendor advisory↗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-2020-7533 · cve.blacktree.nl