CVE-2019-6856

HIGH
7.5
CVSS Score
Published: January 6, 2020 at 10:57 PM UTC
Updated: June 17, 2026 at 02:39 AM UTC
60 products affected across 1 vendorModicon M580 FirmwareModicon M340 Firmware140CPU65150 Firmware

Using Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) by Schneider Electric SE?

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu65150 (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu65160 (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu65160s (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu65260 (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu65860 (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu67060 (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu67160 (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu67160s (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu67260 (same device)
v < 3.52
Affected range stops below 3.52, so it looks safe — our inference, not a vendor statement
schneider-electric-140cpu67261 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_MISCThird Party AdvisoryUS Government Resource
https://www.us-cert.gov/ics/advisories/icsa-20-016-01

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-754

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