CVE-2021-34821: Cross Site Scripting (XSS) vulnerability exists in AAT Novus Management System through 1.51.2

Q: How do I fix CVE-2021-34821?

novus management system: upgrade to newer than 1.51.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-34821 being exploited?

CVE-2021-34821 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-34821 affect?

CVE-2021-34821 affects novus management system. Severity is medium (CVSS 6.1). 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

Q: How urgent is CVE-2021-34821?

Priority 36/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2021-34821 is a medium-severity flaw (CVSS 6.1) affecting novus management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-07-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: aat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-19 18:15 UTCPublished CVE record published
2026-06-17 03:56 UTCUpdated Record last modified

aat novus management system UPGRADE

Affected: <= 1.51.2

Fixed in: newer than 1.51.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy novus-management-system || rpm -q novus-management-system || novus-management-system --version

2. UPGRADE to newer than 1.51.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade novus-management-system

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade novus-management-system

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-34821?

novus management system: upgrade to newer than 1.51.2. Exact commands for each OS are on this page.

Is CVE-2021-34821 being exploited?

CVE-2021-34821 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-34821 affect?

CVE-2021-34821 affects novus management system. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2021-34821?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2021-34820 HIGH 7.5 UPGRADE Web Path Directory Traversal in the Novus HTTP Server

References

← Back to latest CVEs