BlackTreeIndependent security intelligence

Full vulnerability report · 2021

CVE-2021-22792High confidence

n/a Modicon M580 CPU (part numbers BMEP* and BMEH, all versions), Modicon M340 CPU (part numbers BMXP34, all versions), Modicon MC80 (part numbers BMKC80, all versions), Modicon Momentum Ethernet CPU (part numbers 171CBU, all versions), PLC Simulator for EcoStruxureª Control Expert, including all Unity Pro versions (former name of EcoStruxureª Control Expert, all versions), PLC Simulator for EcoStruxureª Process Expert including all HDCS versions (former name of EcoStruxureª Process Expert, all versions), Modicon Quantum CPU (part numbers 140CPU, all versions), Modicon Premium CPU (part numbers TSXP5, all versions) — NULL Pointer Dereference

n/a · Modicon M580 CPU (part numbers BMEP* and BMEH*, all versions), Modicon M340 CPU (part numbers BMXP34*, all versions), Modicon MC80 (part numbers BMKC80*, all versions), Modicon Momentum Ethernet CPU (part numbers 171CBU*, all versions), PLC Simulator for EcoStruxureª Control Expert, including all Unity Pro versions (former name of EcoStruxureª Control Expert, all versions), PLC Simulator for EcoStruxureª Process Expert including all HDCS versions (former name of EcoStruxureª Process Expert, all versions), Modicon Quantum CPU (part numbers 140CPU*, all versions), Modicon Premium CPU (part numbers TSXP5*, all versions)

7.5HighCVSS 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-2021-222-04 · CSAF 2.0 · revision 7.0.0 · finalSchneider Electric CPCERTModicon PAC Controllers and PLC Simulator for EcoStruxure™ Control Expert and EcoStruxure™ Process Expert

8 known affected

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

Schneider Electric Modicon M580 CPU <SV4.10
Schneider Electric Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Versions prior to SV4.21
Schneider Electric Modicon M340 CPU <3.50
Schneider Electric Modicon Momentum CPU All versions <SV2.6
Schneider Electric PLC Simulator for EcoStruxure™ Control Expert All versions
Schneider Electric PLC Simulator for EcoStruxure™ Process Expert All versions
Schneider Electric Legacy Modicon Premium and Quantum All versions
Schneider Electric Modicon Premium CPU All versions

Summary: A CWE-476: NULL Pointer Dereference vulnerability exists that could cause a Denial of Service on the Modicon PLC controller / simulator when updating the controller application with a specially crafted project file.
Remediation: M340 V3.50 includes a fix for these vulnerabilities and is available for download here: https://www.se.com/ww/en/download/document/BMXP34xxxxx_SV_03.50/

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-2021-9927

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

What, why and how

A CWE-476: NULL Pointer Dereference vulnerability that could cause a Denial of Service on the Modicon PLC controller / simulator when updating the controller application with a specially crafted project file exists in Modicon M580 CPU (part numbers BMEP* and BMEH*, all versions), Modicon M340 CPU (part numbers BMXP34*, all versions), Modicon MC80 (part numbers BMKC80*, all versions), Modicon Momentum Ethernet CPU (part numbers 171CBU*, all versions), PLC Simulator for EcoStruxureª Control Expert, including all Unity Pro versions (former name of EcoStruxureª Control Expert, all versions), PLC Simulator for EcoStruxureª Process Expert including all HDCS versions (former name of EcoStruxureª Process Expert, all versions), Modicon Quantum CPU (part numbers 140CPU*, all versions), Modicon Premium CPU (part numbers TSXP5*, all versions).

What

Why

The product dereferences a pointer that it expects to be valid but is NULL.

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

Why

The product dereferences a pointer that it expects to be valid but is NULL.

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.

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 → NULL Pointer Dereference → disrupt the affected service
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-476 ↗
CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.
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:N/I:N/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.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.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-476

Official authority intelligence

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

ENISA EUVD · EUVD-2021-9927Official EUVD mapping

0 linked advisory records.

Official EUVD record

CERT-FR · French · CERTFR-2023-AVI-0273Multiples vulnérabilités dans les produits Schneider

De multiples vulnérabilités ont été découvertes dans les produits Schneider. Elles permettent à un attaquant de provoquer un déni de service à distance.

Official advisory

CERT-FR · French · CERTFR-2022-AVI-717Multiples vulnérabilités dans les produits Schneider

d?id=CVE-2021-22778 Référence CVE CVE-2021-22779 https://www.cve.org/CVERecord?id=CVE-2021-22779 Référence CVE CVE-2021-22780 https://www.cve.org/CVERecord?id=CVE-2021-22780 Référence CVE CVE-2021-22781 https://www.cve.org/CVERecord?id=CVE-2021-22781 Référence CVE CVE-2021-22782 https://www.cve.org/CVERecord?id=CVE-2021-22782 Référence CVE CVE-2021-22786 https://www.cve.org/CVERecord?id=CVE-2021-22786 Référence CVE CVE-2021-22789 https://www.cve.org/CVERecord?id=CVE-2021-22789 Référence CVE CVE-2021-22790 https://www.cve.org/CVERecord?id=CVE-2021-22790 Référence CVE CVE-2021-22791 https://www.cve.org/CVERecord?id=CVE-2021-22791 Référence CVE CVE-2021-22792 https://www.cve.org/CVERecord?id=CVE-2021-22792 Référence CVE CVE-2021-4104 https://www.cve.org/CVERecord?id=CVE-2021-4104 Référence CVE CVE-2021-44228 https://www.cve.org/CVERecord?id=CVE-2021-44228 Référence CVE CVE-2021-44832 https://www.cve.org/CVERecord?id=CVE-2021-44832 Référence CVE CVE-2021-45046 https://www.cve.org/CVERecord?id=CVE-2021-45046 Référence CVE CVE-2021-45105 https://www.cve.org/CVERecord?id=CVE-2021-45105 Référence CVE CVE-2022-34759 https://www.cve.org/CVERecord?id=CVE-2022-34759 Référence CVE CVE-2022-34760 https://www.cve.org/CVERecord?id=CVE-2022-34760 Référence CVE CVE-2022-34761 https://www.cve.org/CVERecord?id=CV

Official advisory

CERT-FR · French · CERTFR-2022-AVI-1093Multiples vulnérabilités dans les produits Schneider

cord?id=CVE-2019-6847 Référence CVE CVE-2020-28895 https://www.cve.org/CVERecord?id=CVE-2020-28895 Référence CVE CVE-2020-35198 https://www.cve.org/CVERecord?id=CVE-2020-35198 Référence CVE CVE-2020-6996 https://www.cve.org/CVERecord?id=CVE-2020-6996 Référence CVE CVE-2021-22779 https://www.cve.org/CVERecord?id=CVE-2021-22779 Référence CVE CVE-2021-22786 https://www.cve.org/CVERecord?id=CVE-2021-22786 Référence CVE CVE-2021-22789 https://www.cve.org/CVERecord?id=CVE-2021-22789 Référence CVE CVE-2021-22790 https://www.cve.org/CVERecord?id=CVE-2021-22790 Référence CVE CVE-2021-22791 https://www.cve.org/CVERecord?id=CVE-2021-22791 Référence CVE CVE-2021-22792 https://www.cve.org/CVERecord?id=CVE-2021-22792 Référence CVE CVE-2022-37300 https://www.cve.org/CVERecord?id=CVE-2022-37300 Référence CVE CVE-2022-37301 https://www.cve.org/CVERecord?id=CVE-2022-37301 Référence CVE CVE-2022-4062 https://www.cve.org/CVERecord?id=CVE-2022-4062 Référence CVE CVE-2022-42970 https://www.cve.org/CVERecord?id=CVE-2022-42970 Référence CVE CVE-2022-42971 https://www.cve.org/CVERecord?id=CVE-2022-42971 Référence CVE CVE-2022-42972 https://www.cve.org/CVERecord?id=CVE-2022-42972 Référence CVE CVE-2022-42973 https://www.cve.org/CVERecord?id=CVE-2022-42973 Gestion détaillée du document le 13 décembre 2022 Version initia

Official advisory

CERT-FR · French · CERTFR-2021-AVI-622Multiples vulnérabilités dans les produits Schneider Electric

d?id=CVE-2021-21827 Référence CVE CVE-2021-21828 https://www.cve.org/CVERecord?id=CVE-2021-21828 Référence CVE CVE-2021-21829 https://www.cve.org/CVERecord?id=CVE-2021-21829 Référence CVE CVE-2021-21830 https://www.cve.org/CVERecord?id=CVE-2021-21830 Référence CVE CVE-2021-22704 https://www.cve.org/CVERecord?id=CVE-2021-22704 Référence CVE CVE-2021-22775 https://www.cve.org/CVERecord?id=CVE-2021-22775 Référence CVE CVE-2021-22789 https://www.cve.org/CVERecord?id=CVE-2021-22789 Référence CVE CVE-2021-22790 https://www.cve.org/CVERecord?id=CVE-2021-22790 Référence CVE CVE-2021-22791 https://www.cve.org/CVERecord?id=CVE-2021-22791 Référence CVE CVE-2021-22792 https://www.cve.org/CVERecord?id=CVE-2021-22792 Référence CVE CVE-2021-22793 https://www.cve.org/CVERecord?id=CVE-2021-22793 Référence CVE CVE-2021-30186 https://www.cve.org/CVERecord?id=CVE-2021-30186 Référence CVE CVE-2021-30188 https://www.cve.org/CVERecord?id=CVE-2021-30188 Référence CVE CVE-2021-30195 https://www.cve.org/CVERecord?id=CVE-2021-30195 Référence CVE CVE-2021-31166 https://www.cve.org/CVERecord?id=CVE-2021-31166 Référence CVE CVE-2021-34527 https://www.cve.org/CVERecord?id=CVE-2021-34527 Gestion détaillée du document le 12 août 2021 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À

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 M580 CPU <SV4.10; Schneider Electric Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Versions prior to SV4.21; Schneider Electric Modicon M340 CPU <3.50; Schneider Electric Modicon Momentum CPU All versions <SV2.6; Schneider Electric PLC Simulator for EcoStruxure™ Control Expert All versions; Schneider Electric PLC Simulator for EcoStruxure™ Process Expert All versions; Schneider Electric Legacy Modicon Premium and Quantum All versions; Schneider Electric Modicon Premium CPU All versions
Fixed: Schneider Electric Modicon M340 CPU 3.50; Schneider Electric Modicon M580 CPU SV4.10; Schneider Electric Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) Versions SV4.21
Action: M340 V3.50 includes a fix for these vulnerabilities and is available for download here: https://www.se.com/ww/en/download/document/BMXP34xxxxx_SV_03.50/
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 2 Sept 2021 · Last source change 29 May 2026, 13:59 UTC · CWE-476 · NULL Pointer Dereference

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-2021-9927

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.

2021-09-02CVE published

2026-05-29Fixed release or patch reference recorded

ENISA EUVD · EUVD-2021-9927↗Vendor CSAF · Schneider Electric CPCERT↗Patch or update reference↗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.

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

EUVD-2021-9927

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

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