How severe is CVE-2021-3325?

CVE-2021-3325 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3325 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3325?

CVE-2021-3325 primarily affects Fibranet Monitorix. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3325?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-3325 published?

CVE-2021-3325 was published on 2021-01-27 and last updated on 2026-06-17.

CVE-2021-3325

CVE-2021-3325 is a critical-severity vulnerability in Fibranet Monitorix with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Fibranet Monitorix
Published: 2021-01-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-3325?: 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.
How severe is CVE-2021-3325?: CVE-2021-3325 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3325 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3325?: CVE-2021-3325 primarily affects Fibranet Monitorix. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3325?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-3325 published?: CVE-2021-3325 was published on 2021-01-27 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:fibranet:monitorix:3.13.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

More vulnerabilities in Fibranet Monitorix

CVE-2013-7070 — Critical (CVSS 9.8): The handle_request function in lib/HTTPServer.pm in Monitorix before 3.3.1 allows remote attackers to execute arbitrary…
CVE-2013-7071 — Medium (CVSS 6.1): Cross-site scripting (XSS) vulnerability in the handle_request function in lib/HTTPServer.pm in Monitorix before 3.4.0…
CVE-2018-7649 — Medium (CVSS 6.1): Monitorix before 3.10.1 allows XSS via CGI variables.

All CVEs affecting Fibranet Monitorix →