CVE-2021-23881Network attack vector

Stored script execution via unsanitized policy events

Published Feb 10, 2021 · Updated Sep 17, 2024

Stored XSS in McAfee Endpoint Security for Windows before 10.7.0 February 2021 Update allows remote authenticated users to run script. The ePO extension stores script supplied by an ENS ePO administrator in a policy event and inserts it into a browser block page without neutralizing it. Execution occurs when a local non-administrator triggers that policy, exposing the user's browser context to the administrator's code.

CVSS severity4.8
Medium
EPSS probability0.64%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in McAfee Endpoint Security for Windows before 10.7.0 February 2021 Update allows remote authenticated users to run script. The ePO extension stores script supplied by an ENS ePO administrator in a policy event and inserts it into a browser block page without neutralizing it. Execution occurs when a local non-administrator triggers that policy, exposing the user's browser context to the administrator's code.

The record

CVE
CVE-2021-23881
Published
Feb 10, 2021
Updated
Sep 17, 2024
Vendor
McAfee
Product
McAfee Endpoint Security for Windows
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.7.x <10.7.0 February 2021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

McAfee · McAfee Endpoint Security for Windowsversion=10.7.x <10.7.0 February 2021

Published CVSS scores

4.8TrellixCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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