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Full vulnerability report · 2020
CVE-2020-7563High confidence

n/a Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details) — Out-of-bounds Write

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

8.8HighCVSS 3.1
Recommended action
Within 7 days

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

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-2020-315-01 · CSAF 2.0 · revision 4.0.0 · finalSchneider Electric CPCERTWeb Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules
9 known affected

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

  • Schneider Electric M340 CPUs BMXP34x <3.40
  • Schneider Electric M340 Communication Ethernet Modules BMXNOR0200H versions prior to 1.7 IR 23
  • Schneider Electric M340 X80 Communication Ethernet Modules BMXNOC0401 versions prior to 2.11
  • Schneider Electric M340 Communication Ethernet modules versions prior to SV03.50
  • Schneider Electric Premium processors with integrated Ethernet COPRO all versions
  • Schneider Electric Premium communication modules all versions
  • Schneider Electric Quantum processors with integrated Ethernet COPRO 140CPU65xxxxx all versions
  • Schneider Electric Quantum communication modules all verions
  • Schneider Electric M340 Communication Ethernet modules versions prior to SV06.70
Summary
A CWE-787: Out-of-bounds Write vulnerability exists which could cause corruption of data, a crash, or code execution when uploading a specially crafted file on the controller over FTP.
Remediation
V3.40 of M340 CPUs includes a fix for these vulnerabilities and is available for download here: https://www.se.com/ww/en/download/document/BMXP34xxxxx_SV_xx.xx/
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-2020-28688

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

A CWE-787: Out-of-bounds Write 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 corruption of data, a crash, or code execution when uploading a specially crafted file on the controller over FTP.

What

A CWE-787: Out-of-bounds Write 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 corruption of data, a crash, or code execution when uploading a specially crafted file on the controller over FTP.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

What

A CWE-787: Out-of-bounds Write 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 corruption of data, a crash, or code execution when uploading a specially crafted file on the controller over FTP.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

An attacker operating through a network path may attempt exploitation with low privileges. 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 → Out-of-bounds Write → disrupt the affected service
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
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-787 ↗

CWE-787: Out-of-bounds Write. The product writes data past the end, or before the beginning, of the intended buffer.

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:L/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.PRLowPrivileges required: The attacker needs basic user-level 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.
NetworkDenial of serviceCWE-787
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2022-AVI-815Multiples vulnérabilités dans les produits Schneider

CVERecord?id=CVE-2020-28895 Référence CVE CVE-2020-35198 https://www.cve.org/CVERecord?id=CVE-2020-35198 Référence CVE CVE-2020-35683 https://www.cve.org/CVERecord?id=CVE-2020-35683 Référence CVE CVE-2020-35684 https://www.cve.org/CVERecord?id=CVE-2020-35684 Référence CVE CVE-2020-35685 https://www.cve.org/CVERecord?id=CVE-2020-35685 Référence CVE CVE-2020-7535 https://www.cve.org/CVERecord?id=CVE-2020-7535 Référence CVE CVE-2020-7536 https://www.cve.org/CVERecord?id=CVE-2020-7536 Référence CVE CVE-2020-7549 https://www.cve.org/CVERecord?id=CVE-2020-7549 Référence CVE CVE-2020-7562 https://www.cve.org/CVERecord?id=CVE-2020-7562 Référence CVE CVE-2020-7563 https://www.cve.org/CVERecord?id=CVE-2020-7563 Référence CVE CVE-2020-7564 https://www.cve.org/CVERecord?id=CVE-2020-7564 Référence CVE CVE-2021-22785 https://www.cve.org/CVERecord?id=CVE-2021-22785 Référence CVE CVE-2021-22787 https://www.cve.org/CVERecord?id=CVE-2021-22787 Référence CVE CVE-2021-22788 https://www.cve.org/CVERecord?id=CVE-2021-22788 Référence CVE CVE-2021-31400 https://www.cve.org/CVERecord?id=CVE-2021-31400 Référence CVE CVE-2021-31401 https://www.cve.org/CVERecord?id=CVE-2021-31401 Référence CVE CVE-2022-0222 https://www.cve.org/CVERecord?id=CVE-2022-0222 Référence CVE CVE-2022-37301 https://www.cve.org/CVERecord?id=CVE-2

Official advisory
CERT-FR · French · CERTFR-2020-AVI-726Multiples vulnérabilités dans les produits Schneider Electric

.cve.org/CVERecord?id=CVE-2020-7553 Référence CVE CVE-2020-7554 https://www.cve.org/CVERecord?id=CVE-2020-7554 Référence CVE CVE-2020-7555 https://www.cve.org/CVERecord?id=CVE-2020-7555 Référence CVE CVE-2020-7556 https://www.cve.org/CVERecord?id=CVE-2020-7556 Référence CVE CVE-2020-7557 https://www.cve.org/CVERecord?id=CVE-2020-7557 Référence CVE CVE-2020-7558 https://www.cve.org/CVERecord?id=CVE-2020-7558 Référence CVE CVE-2020-7559 https://www.cve.org/CVERecord?id=CVE-2020-7559 Référence CVE CVE-2020-7561 https://www.cve.org/CVERecord?id=CVE-2020-7561 Référence CVE CVE-2020-7562 https://www.cve.org/CVERecord?id=CVE-2020-7562 Référence CVE CVE-2020-7563 https://www.cve.org/CVERecord?id=CVE-2020-7563 Référence CVE CVE-2020-7564 https://www.cve.org/CVERecord?id=CVE-2020-7564 Référence CVE CVE-2020-7565 https://www.cve.org/CVERecord?id=CVE-2020-7565 Référence CVE CVE-2020-7566 https://www.cve.org/CVERecord?id=CVE-2020-7566 Référence CVE CVE-2020-7567 https://www.cve.org/CVERecord?id=CVE-2020-7567 Référence CVE CVE-2020-7570 https://www.cve.org/CVERecord?id=CVE-2020-7570 Référence CVE CVE-2020-7571 https://www.cve.org/CVERecord?id=CVE-2020-7571 Référence CVE CVE-2020-7572 https://www.cve.org/CVERecord?id=CVE-2020-7572 Gestion détaillée du document le 12 novembre 2020 Version initiale Alertes Av

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 BMXP34x <3.40; Schneider Electric M340 Communication Ethernet Modules BMXNOR0200H versions prior to 1.7 IR 23; Schneider Electric M340 X80 Communication Ethernet Modules BMXNOC0401 versions prior to 2.11; Schneider Electric M340 Communication Ethernet modules versions prior to SV03.50; Schneider Electric Premium processors with integrated Ethernet COPRO all versions; Schneider Electric Premium communication modules all versions; Schneider Electric Quantum processors with integrated Ethernet COPRO 140CPU65xxxxx all versions; Schneider Electric Quantum communication modules all verions; Schneider Electric M340 Communication Ethernet modules versions prior to SV06.70
Fixed
Schneider Electric M340 CPUs BMXP34x 3.40; Schneider Electric M340 Communication Ethernet Modules BMXNOR0200H 1.7 IR 23; Schneider Electric M340 X80 Communication Ethernet Modules BMXNOC0401 2.11; Schneider Electric M340 Communication Ethernet modules SV03.50; Schneider Electric M340 Communication Ethernet modules SV06.70
Action
V3.40 of M340 CPUs includes a fix for these vulnerabilities and is available for download here: https://www.se.com/ww/en/download/document/BMXP34xxxxx_SV_xx.xx/
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 18 Nov 2020 · Last source change 29 May 2026, 13:24 UTC · CWE-787 · Out-of-bounds Write

CVE recordCVE.org · 5.2
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-2020-28688
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-2020-28688↗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.
Free version - for non-commercial use only.CVE-2020-7563 · cve.blacktree.nl