CVE-2017-6021 Denial of service in ClearSCADA

High 7.5 Published 14 May 2018 Updated 16 Sep 2024

An attacker can cause the ClearSCADA server and communication drivers to terminate by sending specially crafted network packets, resulting in a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2017-6021?

CVE-2017-6021 is a high-severity denial of service vulnerability in Schneider Electric SE ClearSCADA, published on 14 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Schneider Electric ClearSCADA 2014 R1 (build 75.5210) and prior, 2014 R1.1 (build 75.5387) and prior, 2015 R1 (build 76.5648) and prior, and 2015 R2 (build 77.5882) and prior, an attacker with network access to the ClearSCADA server can send specially crafted sequences of commands and data packets to the ClearSCADA server that can cause the ClearSCADA server process and ClearSCADA communications driver processes to terminate. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-20

Which versions are affected by CVE-2017-6021?

It affects 2 products.

Products include Aveva Clearscada, Schneider-Electric Clearscada.

How do I fix CVE-2017-6021?

No fix has been published for CVE-2017-6021 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2017-6021 being exploited?

There is no known exploitation of CVE-2017-6021 in the wild and no public exploit code.

Sources

Also known as GHSA-xc24-4mjv-9pwv.