CVE-2021-25296: Technical Deep-Dive (Auto Refreshed)

Generated on 2026-04-05T17:14:13.129Z. This file is automatically regenerated every 30 minutes by the CVE AI enrichment job using web sources (NVD, MITRE, CISA KEV, GitHub).

Executive Technical Summary

Nagios XI version xi-5.7.5 is affected by OS command injection. The vulnerability exists in the file /usr/local/nagiosxi/html/includes/configwizards/windowswmi/windowswmi.inc.php due to improper sanitization of authenticated user-controlled input by a single HTTP request, which can lead to OS command injection on the Nagios XI server.

• Context preserved from previous revision: Nagios XI version xi-5.7.5 is affected by OS command injection. The vulnerability exists in the file /usr/local/nagiosxi/html/includes/configwizards/windowswmi/windowswmi.inc.php due to improper sanitization of authenticated user-controlled input by a single HTTP request, which can lead to OS command injection on the Nagios XI server. Notes: Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

Technical Details

• CVE: CVE-2021-25296
• KEV date added: 2022-01-18
• KEV due date: 2022-02-01
• NVD published: 2021-02-15
• NVD modified: 2025-11-03
• MITRE modified: 2025-10-21
• CVSS base score: 8.8
• CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
• CVSS exploitability score: 2.8
• CVSS impact score: 5.9
• Attack vector: Network
• Attack complexity: Low
• Privileges required: Low
• User interaction: None
• Scope: Unchanged
• Confidentiality impact: High
• Integrity impact: High
• Availability impact: High

Versions and Products Impacted

• nagios / nagios xi (versions: >= 5.5.6, <= 5.7.5)
• n/a / n/a (versions: n/a)

Weakness Classification

• NVD-CWE-Other
• CWE-noinfo Not enough information

Repositories for Lab Validation (Public Examples)

• Ostorlab/KEV | stars: 608 | updated: 2026-03-23 | https://github.com/Ostorlab/KEV
  Notes: Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
• phantom-offensive/AppAssaultLab | stars: 2 | updated: 2026-04-01 | https://github.com/phantom-offensive/AppAssaultLab
  Notes: Vulnerable real-world applications lab — 11 CVEs, 15 containers, real exploits, real RCE
• plzheheplztrying/cve_monitor | stars: 0 | updated: 2025-07-04 | https://github.com/plzheheplztrying/cve_monitor

People and Organizations Mentioned

• mitre
• Nagios
• Nagios XI
• Ostorlab
• phantom-offensive
• plzheheplztrying

Practical Defensive Validation (Authorized Only)

1. Use only isolated environments and systems you own or are explicitly authorized to test.
2. Snapshot infrastructure before validation and preserve baseline logs (EDR, SIEM, OS, app).
3. Deploy nagios / nagios xi (versions: >= 5.5.6, <= 5.7.5) with synthetic data and validate strict server-side input validation and parameterization.
4. Replay safe payload patterns through WAF/IDS tuning pipelines to reduce false negatives.
5. Correlate request IDs with app/database logs to improve root-cause analysis speed.

References

• NVD record: https://nvd.nist.gov/vuln/detail/CVE-2021-25296
• MITRE CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25296
• CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• CISA KEV JSON feed: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
• KEV notes: https://nvd.nist.gov/vuln/detail/CVE-2021-25296
• http://nagios.com
• http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html
• http://packetstormsecurity.com/files/170924/Nagios-XI-5.7.5-Remote-Code-Execution.html
• https://assets.nagios.com/downloads/nagiosxi/versions.php
• https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md
• https://www.fastly.com/blog/anatomy-of-a-command-injection-cve-2021-25296-7-8-with-metasploit-module-and
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-25296
• Repository example: https://github.com/Ostorlab/KEV
• Repository example: https://github.com/phantom-offensive/AppAssaultLab
• Repository example: https://github.com/plzheheplztrying/cve_monitor

This content is for defensive security training and authorized validation only.