#VU24372 Improper Check for Unusual or Exceptional Conditions in Schneider Electric products - CVE-2019-6857

Vulnerability identifier: #VU24372

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-6857

CWE-ID: N/A

Exploitation vector: Network

Exploit availability: No

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

Description

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.

Mitigation
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

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External links
https://www.se.com/ww/en/download/document/SEVD-2019-344-01

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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.