6.1

CVE-2021-41823: kemptechnologies web_application_firewall Cross-site Scripting

CVSS: 6.1v3.1MediumModified
Published 01-01-2023Last modified 11-04-2025
Open JSON

Vulnerability summary

CVE-2021-41823 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in kemptechnologies web_application_firewall. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.50%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 01-01-2023
    PublishedVulnerability first disclosed.
  2. 11-04-2025
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

0.00 pp

From 0.49% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (pastebin.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Kemptechnologies1 product

1 vendor · 1 product

References

1 links