CVE-2019-6819

mediumpriority · track · 30EPSS 0.011 · 66 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.13% (66th) EPSS

CVSS 5 · medium

Is it mine?

17 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists which could cause a possible Denial of Service when specific Modbus frames are sent to the controller in the products: Modicon M340 - firmware versions prior to V3.01, Modicon M580 - firmware versions prior to V2.80, All firmware versions of Modicon Quantum and Modicon Premium.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedModicon M340cisa_csaf_ot
Modicon M580 - The vulnerability is fixed in v2.80
FixedModicon M580cisa_csaf_ot
Modicon M580 - The vulnerability is fixed in v2.80
FixedModicon Premiumcisa_csaf_ot
Modicon M580 - The vulnerability is fixed in v2.80
FixedModicon Quantumcisa_csaf_ot
Modicon M580 - The vulnerability is fixed in v2.80
MitigationModicon M340cisa_csaf_ot
All controllers should reside in locked cabinets and never be left in the “Program” mode.
MitigationModicon M580cisa_csaf_ot
All controllers should reside in locked cabinets and never be left in the “Program” mode.
MitigationModicon Premiumcisa_csaf_ot
All controllers should reside in locked cabinets and never be left in the “Program” mode.
MitigationModicon Quantumcisa_csaf_ot
All controllers should reside in locked cabinets and never be left in the “Program” mode.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-754USprimaryCWE-754USCWE-754US

affected products (17)

Products and version ranges known to be affected.

Modicon M340: Firmware versions prior to v3.01all versionscisa_csaf_otUS
Modicon M580: Firmware versions prior to v2.80all versionscisa_csaf_otUS
Modicon Premium: all versionsall versionscisa_csaf_otUS
Modicon Quantum: all versionsall versionscisa_csaf_otUS
Schneider Electric Software, LLC Modicon M340< 3.01cisa_csaf_otUS
Schneider Electric Software, LLC Modicon M580< 2.80cisa_csaf_otUS
Schneider Electric Software, LLC Modicon Premiumall versionscisa_csaf_otUS
Schneider Electric Software, LLC Modicon Quantumall versionscisa_csaf_otUS
n/a Modicon Controllers, Modicon M340 - firmware versions prior to V3.01 Modicon M580 - firmware versions prior to V2.80 All firmware versions of Modicon Quantum and Modicon Premium≤ Modicon Controllers, Modicon M340 - firmware versions prior to V3.01 Modicon M580 - firmware versions prior to V2.80 All firmware versions of Modicon Quantum and Modicon Premiumenisa_euvdEU
Schneider Electric Modicon M340≤ 3.01fstec_bduRU
Schneider Electric Modicon M580≤ 2.80fstec_bduRU
Schneider Electric Modicon Premiumall versionsfstec_bduRU
Schneider Electric Modicon Quantumall versionsfstec_bduRU
schneider-electric modicon m340 firmware< 3.01nvdUScpe:2.3:o:schneider-electric:modicon_m340_firmware:*:*:*:*:*:*:*:*
schneider-electric modicon m580 firmware< 2.80nvdUScpe:2.3:o:schneider-electric:modicon_m580_firmware:*:*:*:*:*:*:*:*
schneider-electric modicon premium firmwareall versionsnvdUScpe:2.3:o:schneider-electric:modicon_premium_firmware:*:*:*:*:*:*:*:*
schneider-electric modicon quantum firmwareall versionsnvdUScpe:2.3:o:schneider-electric:modicon_quantum_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-19-183-01Schneider Electric Modicon Controllers2019-07-02icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could result in a denial-of-service condition.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot nvd NVD CVE.org MITRE

published 2019-05-22modified 2026-06-17

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references (10)

External citations — patches, advisories, analysis.

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