How severe is CVE-2021-31838?

CVE-2021-31838 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-31838 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31838?

CVE-2021-31838 affects Mcafee Mvision Edr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31838?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-31838 published?

CVE-2021-31838 was published on 2021-06-29 and last updated on 2026-06-17.

CVE-2021-31838

CVE-2021-31838 is a high-severity vulnerability in Mcafee Mvision Edr with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.4)
CVSS v2: 9.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Mcafee Mvision Edr
Published: 2021-06-29
Last modified: 2026-06-17

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'.

Frequently asked questions

What is CVE-2021-31838?: 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'.
How severe is CVE-2021-31838?: CVE-2021-31838 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-31838 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31838?: CVE-2021-31838 affects Mcafee Mvision Edr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31838?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-31838 published?: CVE-2021-31838 was published on 2021-06-29 and last updated on 2026-06-17.

References

https://kc.mcafee.com/corporate/index?page=content&id=SB10342

Affected products (1)

cpe:2.3:a:mcafee:mvision_edr:*:*:*:*:*:*:*:*

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