CVE-2021-41823

Name: CVE-2021-41823
Creator: NVD / NIST
Published: 2023-01-01T06:15:09.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2021-41823 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. The Web Application Firewall (WAF) in Kemp LoadMaster 7.2.54.1 allows certain uses of onmouseover to bypass an XSS protection mechanism.. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

The Web Application Firewall (WAF) in Kemp LoadMaster 7.2.54.1 allows certain uses of onmouseover to bypass an XSS protection mechanism.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.49%

38.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Kemptechnologies	Web Application Firewall	7.2.54.1

References

https://pastebin.com/kpx9NvbfExploit, Third Party Advisory
https://pastebin.com/kpx9NvbfExploit, Third Party Advisory

Timeline

Published: Jan 1, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41823?

The Web Application Firewall (WAF) in Kemp LoadMaster 7.2.54.1 allows certain uses of onmouseover to bypass an XSS protection mechanism.

How severe is CVE-2021-41823?

CVE-2021-41823 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41823?

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-2021-41823?

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

Scan your code now

Source: NVD / NIST