Is CVE-2021-31838 actively exploited?

No active exploitation of CVE-2021-31838 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-31838 be exploited remotely?

Yes. CVE-2021-31838 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-31838?

CVE-2021-31838 has a CVSS score of 9.1 (CRITICAL).

HOME VULNERABILITIESCVE-2021-31838

CRITICAL

CVE-2021-31838

CWE-78Published: June 29, 2021· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official Description

A command injection vulnerability in MVISION EDR (MVEDR) prior to 3.4.0 allows an authenticated MVEDR administrator to trigger the EDR client to execute arbitrary commands through PowerShell using the EDR functionality 'execute reaction'.

NVD Source

Technical Analysis

CVE-2021-31838 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 9.1.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.