CVE-2019-6821

MEDIUM
6.5
CVSS Score
Published: May 22, 2019 at 07:42 PM UTC
Updated: June 17, 2026 at 02:39 AM UTC
8 products affected across 1 vendorModicon M580 FirmwareModicon M340 FirmwareModicon Quantum Firmware

Using Modicon Controllers, Modicon M580 firmware versions prior to V2.30, and all firmware versions of Modicon M340, Modicon Premium, Modicon Quantum by N/A?

Get instant alerts when new vulnerabilities affect Modicon Controllers, Modicon M580 firmware versions prior to V2.30, and all firmware versions of Modicon M340, Modicon Premium, Modicon Quantum - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM6.5
Exploit prediction
EPSS 2%

Description

CWE-330: Use of Insufficiently Random Values vulnerability, which could cause the hijacking of the TCP connection when using Ethernet communication in Modicon M580 firmware versions prior to V2.30, and all firmware versions of Modicon M340, Modicon Premium, Modicon Quantum.

Affected

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

All versions
schneider-electric-modicon-m340 (same device)
v < 2.30
Affected range stops below 2.30, so it looks safe — our inference, not a vendor statement
schneider-electric-modicon-m580 (same device)
All versions
schneider-electric-modicon-premium (same device)
All versions
schneider-electric-modicon-quantum (same device)

Remediation

No guide yet

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

References (3)

VDB Entryx_refsource_BIDThird Party Advisory
http://www.securityfocus.com/bid/108366
x_refsource_MISCThird Party AdvisoryUS Government Resource
https://ics-cert.us-cert.gov/advisories/ICSA-19-136-01

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-330

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card