Is CVE-2017-6021 actively exploited?

No active exploitation of CVE-2017-6021 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2017-6021 be exploited remotely?

Yes. CVE-2017-6021 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2017-6021?

CVE-2017-6021 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2017-6021

CWE-20Published: May 14, 2018· Updated: Jun 17, 2026

7.5

CVSS v3.1

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).

NVD Source

Technical Analysis

CVE-2017-6021 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.