CVE-2021-3325

Name: CVE-2021-3325
Creator: NVD / NIST
Published: 2021-01-27T19:15:13.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.23%

Last modified Jun 17, 2026

CVE-2021-3325 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Monitorix 3.13.0 allows remote attackers to bypass Basic Authentication in a default installation (i.e., an installation without a hosts_deny option). This issue occurred because a new access-control feature was introduced without considering that some exiting installations became unsafe, upon an update to 3.13.0, unless the new feature was immediately configured.. EPSS estimates a 2.23% chance of exploitation in the next 30 days.

Description

Monitorix 3.13.0 allows remote attackers to bypass Basic Authentication in a default installation (i.e., an installation without a hosts_deny option). This issue occurred because a new access-control feature was introduced without considering that some exiting installations became unsafe, upon an update to 3.13.0, unless the new feature was immediately configured.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.23%

80.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Fibranet	Monitorix	3.13.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33

References

https://github.com/mikaku/Monitorix/commit/d6816e20da1a98bcdc6372d9c36a093df5238f4aPatch, Third Party Advisory
https://github.com/mikaku/Monitorix/compare/v3.13.0...v3.13.1Patch, Third Party Advisory
https://github.com/mikaku/Monitorix/issues/309Exploit, Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/67DDUU56LP76AJ2K7WJ733QPL2FHKKNG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGG6WK44CYY6GEFRTCUEDANVNSX5NDH7/
https://www.monitorix.org/news.html?n=20210127Release Notes, Vendor Advisory
https://github.com/mikaku/Monitorix/commit/d6816e20da1a98bcdc6372d9c36a093df5238f4aPatch, Third Party Advisory
https://github.com/mikaku/Monitorix/compare/v3.13.0...v3.13.1Patch, Third Party Advisory
https://github.com/mikaku/Monitorix/issues/309Exploit, Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/67DDUU56LP76AJ2K7WJ733QPL2FHKKNG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGG6WK44CYY6GEFRTCUEDANVNSX5NDH7/
https://www.monitorix.org/news.html?n=20210127Release Notes, Vendor Advisory

Timeline

Published: Jan 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3325?

How severe is CVE-2021-3325?

CVE-2021-3325 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3325?

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-2021-3325?

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

Scan your code now

Source: NVD / NIST