CVE-2021-3277
Nagios XI 5.7.5 and earlier allows authenticated admins to upload arbitrary files due to improper...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-3277- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-3277- Updated
- 2026-11-02
EUVDEUVD-2021-26615 No score
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.
- Record
EUVD-2021-26615- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xj6h-r3q8-7cmf No score
Nagios XI 5.7.5 and earlier allows authenticated admins to upload arbitrary files due to improper...
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.
- Record
GHSA-xj6h-r3q8-7cmf- Weakness
- CWE-434
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3277 is a high vulnerability (CVSS 7.2) in Nagios Xi, published June 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 59.0%, the 99th percentile. No source names a fixed version.