#VU21483 Uncaught Exception in Modicon M340 and Modicon M580 - CVE-2019-6829

Vulnerability identifier: #VU21483

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-2019-6829

CWE-ID: CWE-248

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Modicon M340
Hardware solutions / Firmware
Modicon M580
Hardware solutions / Firmware

Vendor: Schneider Electric

Description
The vulnerability allows a remote attacker to cause a denial of service (DoS) condition on the target system.

The vulnerability exists due to uncaught exception vulnerability when writing to specific memory addresses in the controller over Modbus. A remote attacker can cause a denial of service condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Modicon M340: before 3.10

Modicon M580: 1.04 - 2.80

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External links
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/

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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.