CVE-2018-8736

HIGHNVD 8.88.9▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.9 because EPSS predicts 47% probability of exploitation within the next 30 days (top 1.3% of all CVEs). NVD baseline CVSS 8.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
8.9EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 46%CVSS: 8.8Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

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

A privilege escalation vulnerability in Nagios XI 5.2.x through 5.4.x before 5.4.13 allows an attacker to leverage an RCE vulnerability escalating to root.

CVSS v3
8.8
EG Score
8.9(high)
EG Risk
71(Track)
EG Risk 71/100SSVC: Track

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
Severity89% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
46%
EPSS %ILE
99%
KEV
Not listed

Published

April 18, 2018

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Aug 18, 2026
🔬 Proof of concept available. Patch available.
generic🟡 PoC Available

Nagios XI 5.2.6 < 5.2.9 / 5.3 / 5.4 - Chained Remote Root - PHP webapps Exploit

https://www.exploit-db.com/exploits/44560/
generic

NagiosXI remote root vulnerability CVE-2018-8733, CVE-2018-8734, CVE-2018-8735, CVE-2018-8736 · GitHub

https://gist.github.com/caleBot/f0a93b5a98574393e0139104eacc2d0f
generic Patch Available
https://assets.nagios.com/downloads/nagiosxi/CHANGES-5.TXT
generic

Nagios Changelogs | Nagios Enterprises

https://www.nagios.com/downloads/nagios-xi/change-log/
generic🟡 PoC Available

Nagios XI 5.2.6-5.4.12 - Chained Remote Code Execution (Metasploit) - Linux remote Exploit

https://www.exploit-db.com/exploits/44969/

Data Freshness Timeline

(refreshed 3× in last 7d / 20× 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.

  1. 2026-09-06 13:44 UTCEPSS rescore
  2. 2026-09-04 13:56 UTCEPSS rescore
  3. 2026-09-02 14:07 UTCEPSS rescore
  4. 2026-09-01 03:32 UTCEPSS rescore
  5. 2026-08-30 19:13 UTCEPSS rescore
  6. 2026-08-30 01:18 UTCEPSS rescore
  7. 2026-08-28 21:36 UTCEPSS rescore
  8. 2026-08-27 14:21 UTCEPSS rescore
  9. 2026-08-26 14:42 UTCEPSS rescore
  10. 2026-08-25 13:45 UTCEPSS rescore
  11. 2026-08-24 14:11 UTCEPSS rescore
  12. 2026-08-21 23:45 UTCEPSS rescore
  13. 2026-08-20 22:51 UTCEPSS rescore
  14. 2026-08-19 17:00 UTCEPSS rescore
  15. 2026-08-18 13:44 UTCEPSS rescore
  16. 2026-08-17 13:43 UTCEPSS rescore
  17. 2026-08-16 02:10 UTCEPSS rescore
  18. 2026-08-15 01:26 UTCEPSS rescore
  19. 2026-08-13 21:56 UTCEPSS rescore
  20. 2026-08-12 13:47 UTCEPSS rescore
  21. 2026-08-08 16:32 UTCEPSS rescore
  22. 2026-08-07 16:23 UTCEPSS rescore
  23. 2026-08-06 13:42 UTCEPSS rescore
  24. 2026-08-04 15:05 UTCEPSS rescore
  25. 2026-08-01 04:12 UTCEPSS rescore
Show 63 more
  1. 2026-07-30 16:24 UTCEPSS rescore
  2. 2026-07-30 01:27 UTCEPSS rescore
  3. 2026-07-28 15:32 UTCEPSS rescore
  4. 2026-07-26 14:51 UTCEPSS rescore
  5. 2026-07-25 14:14 UTCEPSS rescore
  6. 2026-07-25 14:14 UTCEPSS rescore
  7. 2026-07-24 14:14 UTCEPSS rescore
  8. 2026-07-24 14:14 UTCEPSS rescore
  9. 2026-07-23 01:37 UTCEG score recompute▲ 0.10
  10. 2026-07-22 22:17 UTCEG score recompute
  11. 2026-07-22 14:05 UTCEPSS rescore
  12. 2026-07-20 17:04 UTCEPSS rescore
  13. 2026-07-20 17:04 UTCEPSS rescore
  14. 2026-07-16 16:59 UTCEPSS rescore
  15. 2026-07-16 16:59 UTCEPSS rescore
  16. 2026-07-15 16:55 UTCEPSS rescore
  17. 2026-07-13 22:27 UTCEPSS rescore
  18. 2026-07-13 06:10 UTCEPSS rescore
  19. 2026-07-12 05:43 UTCEPSS rescore
  20. 2026-07-09 19:06 UTCEPSS rescore
  21. 2026-07-01 15:03 UTCEPSS rescore
  22. 2026-07-01 15:03 UTCEPSS rescore
  23. 2026-06-29 14:03 UTCEPSS rescore
  24. 2026-06-28 04:53 UTCEPSS rescore
  25. 2026-06-28 04:53 UTCEPSS rescore
  26. 2026-06-27 03:06 UTCEPSS rescore
  27. 2026-06-27 03:06 UTCEPSS rescore
  28. 2026-06-25 13:47 UTCEPSS rescore
  29. 2026-06-25 13:47 UTCEPSS rescore
  30. 2026-06-24 14:02 UTCEPSS rescore
  31. 2026-06-24 14:02 UTCEPSS rescore
  32. 2026-06-23 21:30 UTCEPSS rescore
  33. 2026-06-23 21:30 UTCEPSS rescore
  34. 2026-06-22 14:23 UTCEPSS rescore
  35. 2026-06-22 14:23 UTCEPSS rescore
  36. 2026-06-21 01:57 UTCEPSS rescore
  37. 2026-06-21 01:57 UTCEPSS rescore
  38. 2026-06-18 17:50 UTCEPSS rescore
  39. 2026-06-18 17:50 UTCEPSS rescore
  40. 2026-06-17 17:50 UTCEPSS rescore
  41. 2026-06-16 17:50 UTCEPSS rescore
  42. 2026-06-16 17:50 UTCEPSS rescore
  43. 2026-06-15 17:45 UTCEPSS rescore
  44. 2026-06-14 23:15 UTCEPSS rescore
  45. 2026-06-14 23:15 UTCEPSS rescore
  46. 2026-06-13 22:58 UTCEPSS rescore
  47. 2026-06-12 23:09 UTCEPSS rescore
  48. 2026-06-12 23:09 UTCEPSS rescore
  49. 2026-06-11 13:57 UTCEPSS rescore
  50. 2026-06-10 22:16 UTCEPSS rescore
  51. 2026-06-10 13:19 UTCEPSS rescore
  52. 2026-06-05 22:45 UTCEPSS rescore
  53. 2026-06-05 22:45 UTCEPSS rescore
  54. 2026-06-05 06:08 UTCEPSS rescore
  55. 2026-06-05 06:08 UTCEPSS rescore
  56. 2026-06-04 13:10 UTCEPSS rescore
  57. 2026-06-04 13:10 UTCEPSS rescore
  58. 2026-06-02 20:11 UTCEPSS rescore
  59. 2026-06-01 13:50 UTCEPSS rescore
  60. 2026-05-29 13:41 UTCEPSS rescore
  61. 2026-05-28 09:11 UTCEG score recompute
  62. 2026-05-28 09:10 UTCGHSA enrichment
  63. 2026-05-27 13:38 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 Metasploit modules) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-44969✓ verified
    First seen Jul 2, 2018

    Nagios XI 5.2.6-5.4.12 - Chained Remote Code Execution (Metasploit)

    Open source ↗
  • Exploit-DBEDB-44560✓ verified
    First seen Apr 30, 2018

    Nagios XI 5.2.6 < 5.2.9 / 5.3 / 5.4 - Chained Remote Root

    Open source ↗
  • Metasploitexploit/linux/http/nagios_xi_chained_rce_2_electric_boogaloo✓ verified
    First seen Apr 17, 2018

    Nagios XI Chained Remote Code Execution

    Open source ↗
  • Metasploitexploit/linux/http/nagios_xi_chained_rce✓ verified
    First seen Mar 6, 2016

    Nagios XI Chained Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2018-8736?
CVE-2018-8736 is a high vulnerability published on April 18, 2018. A privilege escalation vulnerability in Nagios XI 5.2.x through 5.4.x before 5.4.13 allows an attacker to leverage an RCE vulnerability escalating to root.
When was CVE-2018-8736 disclosed?
CVE-2018-8736 was first published in the National Vulnerability Database on April 18, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-8736 actively exploited?
CVE-2018-8736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 46% probability of exploitation in the next 30 days, which ranks it in the top 1.3% of all scored CVEs.
What is the CVSS score of CVE-2018-8736?
CVE-2018-8736 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.9.
How do I remediate CVE-2018-8736?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8736, 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.

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