No exploitation reportedFix available

CVE-2019-6819

Q: Is CVE-2019-6819 actively exploited?

Active exploitation of CVE-2019-6819 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-6819?

CVE-2019-6819 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2019-05-22
Fixed in3.01
WeaknessCWE-754

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2019-05-2220:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-6819?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-6819?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Schneider-electric modicon m340 firmwareversion to verify

Branch	Affected	Fixed in	Source
3.1	< 3.01	3.01	NVD

Schneider-electric modicon m580 firmwareversion to verify

Branch	Affected	Fixed in	Source
2.80	< 2.80	2.80	NVD

Schneider-electric modicon premium firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-19-183-01 CISA4 known affected
Schneider Electric Modicon Controllers
Modicon M340: Firmware versions prior to v3.01 · Modicon Quantum: all versions · Modicon Premium: all versions · +1 more

Full record on NVD

Fix

Update Schneider-electric modicon m340 firmware to 3.01
Vendor fix CISA ICSA-19-183-01 · 4 productsModicon M580 - The vulnerability is fixed in v2.80
Mitigation from the vendor CISA ICSA-19-183-01 · 4 productsSchneider Electric has recommended the following to mitigate this vulnerability.
Mitigation from the vendor CISA ICSA-19-183-01 · 4 productsModicon M340 - The vulnerability is fixed in v3.01 and is available for download
Mitigation from the vendor CISA ICSA-19-183-01 · 4 productsBMXP3420302 and CL and H: https://www.schneider-electric.com/en/download/document/BMXP3420302_Firmwares/
Mitigation from the vendor CISA ICSA-19-183-01 · 4 productsBMXP342020 and H: https://www.schneider-electric.com/en/download/document/BMXP342020_Firmwares/
Mitigation from the vendor CISA ICSA-19-183-01 · 4 productsBMXP342000: https://www.schneider-electric.com/en/download/document/BMXP342000_Firmwares/

Advisories and patches

www.schneider-electric.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-05-29
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.52026-05-29
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-754read 2026-10-23
NVDweakness (CWE)CWE-754read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2019-05-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-6819?

Is CVE-2019-6819 actively exploited?

Active exploitation of CVE-2019-6819 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-6819?

CVE-2019-6819 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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