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Full vulnerability report · 2019
CVE-2019-6807High confidence

n/a Modicon M580 Modicon M340 Modicon Quantum Modicon Premium: Improper Handling of Exceptional Conditions

n/a · Modicon M580 Modicon M340 Modicon Quantum Modicon Premium

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; 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-2019-134-11 · CSAF 2.0 · revision 14.0.0 · finalSchneider Electric CPCERTMultiple Vulnerabilities in Modicon Controller Products
14 known affected

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

  • Modicon M580 Firmware Versions prior to v2.90 installed on Modicon M580 Controller
  • Modicon M340 Firmware Versions prior to v3.10 installed on Modicon M340 Controller
  • Modicon MC80 Firmware Versions prior to v1.80 installed on Modicon MC80 Controller (BMKC8020301)
  • Modicon Momentum Unity M1E Processor Firmware Versions prior to sv2.6 installed on Modicon Momentum Unity M1E Processor (part numbers 171CBU*) Controller
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU65150 [C] & 140CPU65160 [C]
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU65260 [C]
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67261 [C]
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67060 [C]
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67160 [C]
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67260 [C]
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU65860 [C]
  • Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67861 [C]
Summary
CWE-248: Uncaught Exception vulnerability exists which could cause a possible denial of service when writing sensitive application variables to the controller over Modbus.
Remediation
Version sv4.20 of Modicon M580 includes a fix for this vulnerability and is available for download here: STEP 1: Update software and firmware. • On the engineering workstation, update to EcoStruxure Control Expert v16.0: https://www.se.com/ww/en/product-range/548-ecostruxure-control-expert-unity-pro/#software-and-firmware • On the Modicon M580 controller, update to firmware SV4.20 or above: https://www.se.com/ww/en/product-range/62098-modicon-m580-epac/#software-and-firmware STEP 2: Update projects in EcoStruxure™ Control Expert by: • Setting up an application password in the project properties • Changing the version of the controller firmware to match the new firmware version of the target controller STEP 3: Rebuild and transfer projects in EcoStruxure™ Control Expert: • Rebuild all current projects
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-2019-16361

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 with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of service when writing sensitive application variables to the controller over Modbus.

What

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of service when writing sensitive application variables to the controller over Modbus.

Why

The product does not handle or incorrectly handles an exceptional condition.

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

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of service when writing sensitive application variables to the controller over Modbus.

Why

The product does not handle or incorrectly handles an exceptional condition.

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.

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.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Handling of Exceptional Conditions → 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-755 ↗

CWE-755: Improper Handling of Exceptional Conditions. The product does not handle or incorrectly handles an exceptional condition.

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-755Public exploit reference
A

Official authority intelligence

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

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
Modicon M580 Firmware Versions prior to v2.90 installed on Modicon M580 Controller; Modicon M340 Firmware Versions prior to v3.10 installed on Modicon M340 Controller; Modicon MC80 Firmware Versions prior to v1.80 installed on Modicon MC80 Controller (BMKC8020301); Modicon Momentum Unity M1E Processor Firmware Versions prior to sv2.6 installed on Modicon Momentum Unity M1E Processor (part numbers 171CBU*) Controller; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU65150 [C] & 140CPU65160 [C]; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU65260 [C]; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67261 [C]; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67060 [C]; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67160 [C]; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67260 [C]; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU65860 [C]; Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU67861 [C]; Modicon Premium Firmware Versions prior to v3.20 installed on Modicon Premium Controller; PLC Simulator default component of EcoStruxure Control Expert Versions prior to v15.1
Fixed
Modicon M580 Firmware Version 4.20 installed on Modicon M580 Controller; Modicon M340 Firmware Version 3.60 installed on Modicon M340 Controller; Modicon MC80 Firmware Version 1.80 installed on Modicon MC80 Controller; Modicon Momentum Unity M1E Processor Firmware Version 2.90 installed on Modicon Momentum Unity M1E Processor (part numbers 171CBU*) Controller; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU65150 [C] & 140CPU65160 [C]; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU65260 [C]; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU67261 [C]; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU67060 [C]; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU67160 [C]; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU67260 [C]; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU65860 [C]; Modicon Quantum Firmware Version 3.60 installed on Modicon Quantum Controller 140CPU67861 [C]; Modicon Premium Firmware Version 3.20 installed on Modicon Premium Controller; EcoStruxure Control Expert Version 15.1
Action
Version sv4.20 of Modicon M580 includes a fix for this vulnerability and is available for download here: STEP 1: Update software and firmware. • On the engineering workstation, update to EcoStruxure Control Expert v16.0: https://www.se.com/ww/en/product-range/548-ecostruxure-control-expert-unity-pro/#software-and-firmware • On the Modicon M580 controller, update to firmware SV4.20 or above: https://www.se.com/ww/en/product-range/62098-modicon-m580-epac/#software-and-firmware STEP 2: Update projects in EcoStruxure™ Control Expert by: • Setting up an application password in the project properties • Changing the version of the controller firmware to match the new firmware version of the target controller STEP 3: Rebuild and transfer projects in EcoStruxure™ Control Expert: • Rebuild all current projects
Workaround
A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04

Evidence and provenance

Published 22 May 2019 · Last source change 4 Aug 2024, 20:31 UTC · CWE-755 · Improper Handling of Exceptional Conditions

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 2026-09-01
European sourceENISA EUVD · EUVD-2019-16361
Product sourceVendor CSAF · Schneider Electric CPCERT
Remediation sourceVendor CSAF · Schneider Electric CPCERT
CWE sourceNIST NVD
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 →
  1. ENISA EUVD mappingEUVD-2019-16361 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2019-16361"}
    ENISA EUVD ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to authoritative remediation link · mitigation.
    Before
    no authoritative guidance recorded
    After
    authoritative remediation link · mitigation
    af854a3a-2127-422b-91ae-364da2661108 ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    af854a3a-2127-422b-91ae-364da2661108 ↗
  4. Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
    Before
    No public exploit
    After
    Public exploit reference
    af854a3a-2127-422b-91ae-364da2661108 ↗
  5. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    NIST NVD ↗
  6. CVSS scoreCVSS score changed from not recorded to 7.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
    Before
    not recorded
    After
    7.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
    NIST NVD ↗
  7. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Mitigation reference recorded
ENISA EUVD · EUVD-2019-16361↗Vendor CSAF · Schneider Electric CPCERT↗CVE authority or vendor reference↗Public exploit 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-2019-6807 · cve.blacktree.nl