CVE-2021-37351

Name: CVE-2021-37351
Creator: NVD / NIST
Published: 2021-08-13T12:15:07.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 2.83%

Last modified Jun 17, 2026

CVE-2021-37351 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Nagios XI before version 5.8.5 is vulnerable to insecure permissions and allows unauthenticated users to access guarded pages through a crafted HTTP request to the server.. EPSS estimates a 2.83% chance of exploitation in the next 30 days.

Description

Nagios XI before version 5.8.5 is vulnerable to insecure permissions and allows unauthenticated users to access guarded pages through a crafted HTTP request to the server.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

2.83%

84.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-276

Affected Software

Vendor	Product	Versions
Nagios	Nagios Xi	< 5.8.5

References

https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory
https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory

Timeline

Published: Aug 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37351?

Nagios XI before version 5.8.5 is vulnerable to insecure permissions and allows unauthenticated users to access guarded pages through a crafted HTTP request to the server.

How severe is CVE-2021-37351?

CVE-2021-37351 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37351?

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-2021-37351?

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

Scan your code now

Source: NVD / NIST