What’s Vulnerable › Vulnerabilities

CVE-2019-6819

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-05-22 · updated 2026-06-17
• Weakness: CWE-754

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.

Affected products

• Schneider-Electric Modicon M340 Firmware: before 3.01 — fixed in 3.01
• Schneider Electric SE Modicon M580: before 2.80 — fixed in 2.80
• Schneider-Electric Modicon Premium Firmware: all versions
• Modicon Quantum - all firmware versions: all versions

How to fix

Upgrade to a fixed version: Schneider-Electric Modicon M340 Firmware 3.01; Schneider Electric SE Modicon M580 2.80. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/109004
• https://www.schneider-electric.com/en/download/document/SEVD-2019-134-05/
• http://www.securityfocus.com/bid/109004
• https://www.schneider-electric.com/en/download/document/SEVD-2019-134-05/

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