CVE-2021-3277

Name: CVE-2021-3277
Creator: NVD / NIST
Published: 2021-06-07T22:15:07.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 54.58%

Last modified Jun 17, 2026

CVE-2021-3277 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. Nagios XI 5.7.5 and earlier allows authenticated admins to upload arbitrary files due to improper validation of the rename functionality in custom-includes component, which leads to remote code execution by uploading php files.. EPSS estimates a 54.58% chance of exploitation in the next 30 days.

Description

Nagios XI 5.7.5 and earlier allows authenticated admins to upload arbitrary files due to improper validation of the rename functionality in custom-includes component, which leads to remote code execution by uploading php files.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

54.58%

98.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Nagios	Nagios Xi	<= 5.7.5

References

https://asaf.me/2021/01/21/nagios-xi-5-7-5-remote-code-execution/Third Party Advisory
https://asaf.me/2021/01/21/nagios-xi-5-7-5-remote-code-execution/Third Party Advisory

Timeline

Published: Jun 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3277?

How severe is CVE-2021-3277?

CVE-2021-3277 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 54.58% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3277?

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-2021-3277?

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

Scan your code now

Source: NVD / NIST