How severe is CVE-2021-23881?

CVE-2021-23881 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-23881 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23881?

CVE-2021-23881 affects Mcafee Endpoint Security. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23881?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-23881 published?

CVE-2021-23881 was published on 2021-02-10 and last updated on 2026-06-17.

CVE-2021-23881

CVE-2021-23881 is a medium-severity vulnerability in Mcafee Endpoint Security with a CVSS 3.x base score of 4.8. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mcafee Endpoint Security
Published: 2021-02-10
Last modified: 2026-06-17

Description

A stored cross site scripting vulnerability in ePO extension of McAfee Endpoint Security (ENS) prior to 10.7.0 February 2021 Update allows an ENS ePO administrator to add a script to a policy event which will trigger the script to be run through a browser block page when a local non-administrator user triggers the policy.

Frequently asked questions

What is CVE-2021-23881?: A stored cross site scripting vulnerability in ePO extension of McAfee Endpoint Security (ENS) prior to 10.7.0 February 2021 Update allows an ENS ePO administrator to add a script to a policy event which will trigger the script to be run through a browser block page when a local non-administrator user triggers the policy.
How severe is CVE-2021-23881?: CVE-2021-23881 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-23881 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23881?: CVE-2021-23881 affects Mcafee Endpoint Security. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23881?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23881 published?: CVE-2021-23881 was published on 2021-02-10 and last updated on 2026-06-17.

References

https://kc.mcafee.com/corporate/index?page=content&id=SB10345

Affected products (1)

cpe:2.3:a:mcafee:endpoint_security:*:*:*:*:*:windows:*:*

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