Is CVE-2021-27388 actively exploited?

No active exploitation of CVE-2021-27388 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27388 be exploited remotely?

Yes. CVE-2021-27388 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27388?

CVE-2021-27388 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-27388

CWE-20Published: June 15, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

SINAMICS medium voltage routable products are affected by a vulnerability in the Sm@rtServer component for remote access that could allow an unauthenticated attacker to cause a denial-of-service condition, and/or execution of limited configuration modifications and/or execution of limited control commands on the SINAMICS Medium Voltage Products, Remote Access (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).

NVD Source

Technical Analysis

CVE-2021-27388 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.