CVE-2021-25298

HIGHNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-01-18), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
8.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 75%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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/cloud-vm/cloud-vm.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.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
99.5%
KEV
⚠ Exploited

Published

February 15, 2021

Last Modified

July 9, 2026

Advisory Details (4)

Auto-updated Jun 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Nagios XI Versions

https://assets.nagios.com/downloads/nagiosxi/versions.php
generic

Nagios® - IT, Network & Server Monitoring Software

http://nagios.com
generic🟡 PoC Available

Command Injection CVE-2021-25296: A Deep Dive | Fastly | Fastly

https://www.fastly.com/blog/anatomy-of-a-command-injection-cve-2021-25296-7-8-with-metasploit-module-and
generic

nagios-xi-5.7.5-bugs/README.md at main · fs0c-sh/nagios-xi-5.7.5-bugs · GitHub

https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 45× in last 7d / 207× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 404 total refreshes for this CVE.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 01:58 UTCEG score recompute
  3. 2026-07-22 22:45 UTCEG score recompute
  4. 2026-07-22 21:07 UTCGHSA enrichment
  5. 2026-07-22 19:40 UTCCISA KEV update
  6. 2026-07-22 16:54 UTCEG score recompute
  7. 2026-07-22 16:54 UTCGHSA enrichment
  8. 2026-07-22 14:06 UTCEPSS rescore
  9. 2026-07-22 14:06 UTCEPSS rescore
  10. 2026-07-22 12:42 UTCGHSA enrichment
  11. 2026-07-22 08:30 UTCGHSA enrichment
  12. 2026-07-22 04:19 UTCGHSA enrichment
  13. 2026-07-22 00:08 UTCGHSA enrichment
  14. 2026-07-21 19:09 UTCGHSA enrichment
  15. 2026-07-21 14:57 UTCGHSA enrichment
  16. 2026-07-21 14:37 UTCCISA KEV update
  17. 2026-07-21 10:46 UTCGHSA enrichment
  18. 2026-07-21 06:34 UTCGHSA enrichment
  19. 2026-07-21 02:22 UTCGHSA enrichment
  20. 2026-07-20 22:08 UTCGHSA enrichment
  21. 2026-07-20 17:57 UTCEG score recompute
  22. 2026-07-20 17:57 UTCGHSA enrichment
  23. 2026-07-20 17:05 UTCEPSS rescore
  24. 2026-07-20 13:45 UTCGHSA enrichment
  25. 2026-07-20 09:34 UTCGHSA enrichment
Show 75 more
  1. 2026-07-20 05:23 UTCGHSA enrichment
  2. 2026-07-20 01:11 UTCGHSA enrichment
  3. 2026-07-19 21:00 UTCGHSA enrichment
  4. 2026-07-19 16:47 UTCEG score recompute
  5. 2026-07-19 16:47 UTCGHSA enrichment
  6. 2026-07-19 14:28 UTCEPSS rescore
  7. 2026-07-19 12:36 UTCGHSA enrichment
  8. 2026-07-19 08:25 UTCGHSA enrichment
  9. 2026-07-19 04:14 UTCEG score recompute
  10. 2026-07-19 04:14 UTCGHSA enrichment
  11. 2026-07-19 02:27 UTCEPSS rescore
  12. 2026-07-19 02:27 UTCEPSS rescore
  13. 2026-07-19 00:02 UTCGHSA enrichment
  14. 2026-07-18 19:48 UTCGHSA enrichment
  15. 2026-07-18 15:37 UTCGHSA enrichment
  16. 2026-07-18 11:26 UTCGHSA enrichment
  17. 2026-07-18 07:14 UTCGHSA enrichment
  18. 2026-07-18 03:02 UTCGHSA enrichment
  19. 2026-07-17 22:51 UTCGHSA enrichment
  20. 2026-07-17 18:39 UTCGHSA enrichment
  21. 2026-07-17 14:27 UTCGHSA enrichment
  22. 2026-07-17 10:15 UTCEG score recompute
  23. 2026-07-17 10:15 UTCGHSA enrichment
  24. 2026-07-17 06:03 UTCGHSA enrichment
  25. 2026-07-17 01:51 UTCGHSA enrichment
  26. 2026-07-16 21:40 UTCGHSA enrichment
  27. 2026-07-16 17:29 UTCGHSA enrichment
  28. 2026-07-16 17:04 UTCCISA KEV update
  29. 2026-07-16 13:17 UTCGHSA enrichment
  30. 2026-07-16 09:06 UTCGHSA enrichment
  31. 2026-07-16 04:54 UTCGHSA enrichment
  32. 2026-07-16 00:42 UTCGHSA enrichment
  33. 2026-07-15 20:31 UTCGHSA enrichment
  34. 2026-07-15 16:55 UTCEPSS rescore
  35. 2026-07-15 16:55 UTCEPSS rescore
  36. 2026-07-15 16:49 UTCCISA KEV update
  37. 2026-07-15 16:20 UTCGHSA enrichment
  38. 2026-07-15 15:04 UTCCISA KEV update
  39. 2026-07-15 12:08 UTCGHSA enrichment
  40. 2026-07-15 07:57 UTCGHSA enrichment
  41. 2026-07-15 03:45 UTCGHSA enrichment
  42. 2026-07-14 23:34 UTCGHSA enrichment
  43. 2026-07-14 19:23 UTCGHSA enrichment
  44. 2026-07-14 18:05 UTCCISA KEV update
  45. 2026-07-14 15:10 UTCGHSA enrichment
  46. 2026-07-14 10:58 UTCGHSA enrichment
  47. 2026-07-14 06:45 UTCGHSA enrichment
  48. 2026-07-14 02:32 UTCGHSA enrichment
  49. 2026-07-13 22:20 UTCGHSA enrichment
  50. 2026-07-13 18:09 UTCGHSA enrichment
  51. 2026-07-13 17:07 UTCCISA KEV update
  52. 2026-07-13 13:57 UTCGHSA enrichment
  53. 2026-07-13 09:46 UTCGHSA enrichment
  54. 2026-07-13 06:10 UTCEPSS rescore
  55. 2026-07-13 05:34 UTCGHSA enrichment
  56. 2026-07-13 01:23 UTCGHSA enrichment
  57. 2026-07-12 21:11 UTCGHSA enrichment
  58. 2026-07-12 16:59 UTCGHSA enrichment
  59. 2026-07-12 12:47 UTCGHSA enrichment
  60. 2026-07-12 08:35 UTCGHSA enrichment
  61. 2026-07-12 05:44 UTCEPSS rescore
  62. 2026-07-12 05:44 UTCEPSS rescore
  63. 2026-07-12 04:23 UTCGHSA enrichment
  64. 2026-07-12 00:11 UTCGHSA enrichment
  65. 2026-07-11 20:00 UTCGHSA enrichment
  66. 2026-07-11 15:49 UTCGHSA enrichment
  67. 2026-07-11 11:37 UTCGHSA enrichment
  68. 2026-07-11 07:26 UTCGHSA enrichment
  69. 2026-07-11 03:14 UTCGHSA enrichment
  70. 2026-07-10 23:02 UTCGHSA enrichment
  71. 2026-07-10 18:50 UTCGHSA enrichment
  72. 2026-07-10 17:52 UTCCISA KEV update
  73. 2026-07-10 14:38 UTCGHSA enrichment
  74. 2026-07-10 10:26 UTCGHSA enrichment
  75. 2026-07-10 06:14 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/linux/http/nagios_xi_configwizards_authenticated_rce✓ verified
    First seen Feb 13, 2021

    Nagios XI 5.5.6 to 5.7.5 - ConfigWizards Authenticated Remote Code Exection

    Open source ↗
  • Nucleihttp/cves/2021/CVE-2021-25298.yaml
    First seen Jan 1, 2021

    Nagios XI 5.5.6-5.7.5 - Authenticated Remote Command Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-25298?
CVE-2021-25298 is a high vulnerability published on February 15, 2021. 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/cloud-vm/cloud-vm.inc.php due to improper sanitization of authenticated user-controlled input by a single HTTP request, which can lead to OS command…
When was CVE-2021-25298 disclosed?
CVE-2021-25298 was first published in the National Vulnerability Database on February 15, 2021, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-25298 actively exploited?
Yes. CISA added CVE-2021-25298 to the Known Exploited Vulnerabilities catalog on January 18, 2022, affecting Nagios Nagios XI. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-25298?
CVE-2021-25298 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-25298?
CVE-2021-25298 affects Nagios Nagios XI. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-25298?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-25298, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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