CVE-2021-34821

Name: CVE-2021-34821
Creator: NVD / NIST
Published: 2021-07-19T18:15:08.79+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.82%

Last modified Jun 17, 2026

CVE-2021-34821 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross Site Scripting (XSS) vulnerability exists in AAT Novus Management System through 1.51.2. The WebUI has wrong HTTP 404 error handling implemented. EPSS estimates a 0.82% chance of exploitation in the next 30 days.

Description

Cross Site Scripting (XSS) vulnerability exists in AAT Novus Management System through 1.51.2. The WebUI has wrong HTTP 404 error handling implemented. A remote, unauthenticated attacker may be able to exploit the issue by sending malicious HTTP requests to non-existing URIs. The value of the URL path filename is copied into the HTML document as plain text tags.

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

0.82%

52.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Aat	Novus Management System	<= 1.51.2

References

https://seclists.org/fulldisclosure/2021/Jul/20Mailing List, Third Party Advisory
https://seclists.org/fulldisclosure/2021/Jul/20Mailing List, Third Party Advisory

Timeline

Published: Jul 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34821?

How severe is CVE-2021-34821?

CVE-2021-34821 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.82% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34821?

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-2021-34821?

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

Scan your code now

Source: NVD / NIST