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Full vulnerability report · 2025
CVE-2025-3112High confidence

Schneider Electric Modicon Controllers M241/M251 — Uncontrolled Resource Consumption

Schneider Electric · Modicon Controllers M241/M251

7.1HighCVSS 4.0
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.
  • EPSS is 0.62% 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 Controllers M241/M251 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-2025-161-02 · CSAF 2.0 · revision 2.0.0 · finalSchneider Electric CPCERTModicon Controllers M241/M251/M258/LMC058/M262
2 known affected

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

  • Schneider Electric Modicon Controllers M241 Versions prior to 5.3.12.51
  • Schneider Electric Modicon Controllers M251 Versions prior to 5.3.12.51
Summary
CWE-400: Uncontrolled Resource Consumption vulnerability exists that could cause Denial of Service when an authenticated malicious user sends manipulated HTTPS Content-Length header to the webserver.
Remediation
Version 5.3.12.51 of Modicon Controllers M241 includes a fix for these vulnerabilities and can be downloaded here: M241:https://www.se.com/ww/en/product-range/62129-modicon-m241-micro-plc/#software-and-firmware •Use the Controller Assistant feature of EcoStruxure™ Automation Expert – Motion v24.1 or EcoStruxure™ Machine Expert v2.3 to update the M241 firmware and perform a reboot. •EcoStruxure™ Automation Expert – Motion V24.1 is available via the Schneider Electric Software Installer: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER. • Additional information is available in the Quick Start Guide, chapter “EcoStruxure™ Automation Expert Platform Installation”.
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-2025-17631

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-400: Uncontrolled Resource Consumption vulnerability exists that could cause Denial of Service when an authenticated malicious user sends manipulated HTTPS Content-Length header to the webserver.

What

CWE-400: Uncontrolled Resource Consumption vulnerability exists that could cause Denial of Service when an authenticated malicious user sends manipulated HTTPS Content-Length header to the webserver.

Why

The product does not properly control the allocation and maintenance of a limited resource.

How

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

What

CWE-400: Uncontrolled Resource Consumption vulnerability exists that could cause Denial of Service when an authenticated malicious user sends manipulated HTTPS Content-Length header to the webserver.

Why

The product does not properly control the allocation and maintenance of a limited resource.

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 → Uncontrolled Resource Consumption → 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
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-400 ↗

CWE-400: Uncontrolled Resource Consumption. The product does not properly control the allocation and maintenance of a limited resource.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: 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.ATNoneAttack requirements: No additional deployment or execution condition is required.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
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-400
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2025-AVI-0485Multiples vulnérabilités dans les produits Schneider Electric

De multiples vulnérabilités ont été découvertes dans les produits Schneider Electric. Elles permettent à un attaquant de provoquer un déni de service à distance et une injection de code indirecte à distance (XSS).

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
Version 5.3.12.51 of Modicon Controllers M241 includes a fix for these vulnerabilities and can be downloaded here: M241:https://www.se.com/ww/en/product-range/62129-modicon-m241-micro-plc/#software-and-firmware •Use the Controller Assistant feature of EcoStruxure™ Automation Expert – Motion v24.1 or EcoStruxure™ Machine Expert v2.3 to update the M241 firmware and perform a reboot. •EcoStruxure™ Automation Expert – Motion V24.1 is available via the Schneider Electric Software Installer: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER. • Additional information is available in the Quick Start Guide, chapter “EcoStruxure™ Automation Expert Platform Installation”.
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 10 Jun 2025 · Last source change 10 Jun 2025, 14:24 UTC · CWE-400 · Uncontrolled Resource Consumption

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-2025-17631
Product sourceVendor CSAF · Schneider Electric CPCERT
Remediation sourceVendor CSAF · Schneider Electric CPCERT
CWE sourceCNA
NVD statusNVD not scheduled

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 5.3.12.51 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Versions prior to 5.3.12.51 · Fixed: Version 5.3.12.51 of Modicon Controllers M241 includes a fix for these vulnerabilities and can be downloaded here: M241:https://www.se.com/ww/en/product-range/62129-modicon-m241-micro-plc/#software-and-firmware •Use the Controller Assistant feature of EcoStruxure™ Automation Expert – Motion v24.1 or EcoStruxure™ Machine Expert v2.3 to update the M241 firmware and perform a reboot. •EcoStruxure™ Automation Expert – Motion V24.1 is available via the Schneider Electric Software Installer: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER. • Additional information is available in the Quick Start Guide, chapter “EcoStruxure™ Automation Expert Platform Installation”.
    Schneider Electric CPCERT ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    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-2025-17631↗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-2025-3112 · cve.blacktree.nl