Denial of service in Schneider Electric Modicon Controllers

Published: 2020-01-17
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-6857
Exploitation vector Network
Public exploit N/A
Vulnerable software
Modicon M580
Hardware solutions / Firmware

Modicon M340
Hardware solutions / Firmware

Modicon Premium
Hardware solutions / Firmware

Modicon Quantum
Hardware solutions / Firmware

Vendor Schneider Electric

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Check for Unusual or Exceptional Conditions

EUVDB-ID: #VU24372

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-6857


Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper check for unusual or exceptional conditions. A remote attacker can cause a denial of service condition in the controller when reading specific memory blocks using Modbus TCP.


Install updates from vendor's website.

Vulnerable software versions

Modicon M580: 1.04 - 2.50

Modicon M340: before 3.01

Modicon Premium: before 3.20

Modicon Quantum: before 3.60

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.