CVE-2021-4038

Name: CVE-2021-4038
Creator: NVD / NIST
Published: 2021-12-09T16:15:08.61+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2021-4038 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. Cross Site Scripting (XSS) vulnerability in McAfee Network Security Manager (NSM) prior to 10.1 Minor 7 allows a remote authenticated administrator to embed a XSS in the administrator interface via specially crafted custom rules containing HTML. NSM did not correctly sanitize custom rule content in all scenarios.. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

Cross Site Scripting (XSS) vulnerability in McAfee Network Security Manager (NSM) prior to 10.1 Minor 7 allows a remote authenticated administrator to embed a XSS in the administrator interface via specially crafted custom rules containing HTML. NSM did not correctly sanitize custom rule content in all scenarios.

Metrics

CVSS 3.1

4.8/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.57%

43.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mcafee	Network Security Manager	< 10.1.7.48

References

https://kc.mcafee.com/corporate/index?page=content&id=SB10375Broken Link
https://kc.mcafee.com/corporate/index?page=content&id=SB10375Broken Link

Timeline

Published: Dec 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4038?

How severe is CVE-2021-4038?

CVE-2021-4038 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4038?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4038?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST