Arbitrary file upload in Nagios Xi

CVE-2021-3277

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.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.590 (99.1th percentile), scored .

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-3277: rose from 0.546 to 0.590.

EPSS over last 30 days · oldest: 0.546 · newest: 0.590 · change: +0.044

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-3277?
CVE-2021-3277 is a high-severity vulnerability in Nagios Xi, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2021-06-07.
How severe is CVE-2021-3277?
High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2021-3277 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.