CVE-2021-25298

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 75%CVSS: 8.8Exploit: cisa kev · ssvc active · Metasploit · epss top5pct · epss high · public exploitExposed: 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 PROB
75%
EPSS %ILE
99%
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 54× in last 7d / 225× 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 857 total refreshes for this CVE.

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