CVE-2018-12550

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.1Exploit: NoneExposed: 0

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

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
68.6%
KEV
Not listed

Published

March 27, 2019

Last Modified

November 21, 2024

References (4)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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. 2026-07-22 14:04 UTCEPSS rescore
  2. 2026-07-21 15:21 UTCEPSS rescore
  3. 2026-07-20 19:32 UTCOSV refresh
  4. 2026-07-20 17:04 UTCEPSS rescore
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  14. 2026-07-13 06:10 UTCEPSS rescore
  15. 2026-07-12 05:43 UTCEPSS rescore
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  21. 2026-07-06 02:20 UTCEPSS rescore
  22. 2026-07-05 02:27 UTCEPSS rescore
  23. 2026-07-04 06:28 UTCEPSS rescore
  24. 2026-07-03 14:56 UTCOSV refresh
  25. 2026-07-02 16:54 UTCEPSS rescore
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  1. 2026-07-01 15:03 UTCEPSS rescore
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  3. 2026-06-30 23:19 UTCEPSS rescore
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  5. 2026-06-29 14:03 UTCEPSS rescore
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  7. 2026-06-28 04:53 UTCEPSS rescore
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  9. 2026-06-27 03:06 UTCEPSS rescore
  10. 2026-06-25 13:47 UTCEPSS rescore
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  18. 2026-06-21 01:57 UTCEPSS rescore
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  20. 2026-06-19 19:23 UTCEPSS rescore
  21. 2026-06-18 17:50 UTCEPSS rescore
  22. 2026-06-18 17:50 UTCEPSS rescore
  23. 2026-06-17 17:50 UTCEPSS rescore
  24. 2026-06-17 17:50 UTCEPSS rescore
  25. 2026-06-16 17:50 UTCEPSS rescore
  26. 2026-06-16 17:50 UTCEPSS rescore
  27. 2026-06-15 17:45 UTCEPSS rescore
  28. 2026-06-15 04:43 UTCOSV refresh
  29. 2026-06-14 23:14 UTCEPSS rescore
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  31. 2026-06-13 22:58 UTCEPSS rescore
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  39. 2026-06-07 15:22 UTCEPSS rescore
  40. 2026-06-07 15:22 UTCEPSS rescore
  41. 2026-06-06 13:45 UTCEPSS rescore
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  43. 2026-06-05 22:45 UTCEPSS rescore
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  45. 2026-06-05 06:08 UTCEPSS rescore
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  49. 2026-06-02 20:11 UTCEPSS rescore
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  51. 2026-06-01 13:49 UTCEPSS rescore
  52. 2026-05-31 22:29 UTCEPSS rescore
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  56. 2026-05-29 13:41 UTCEPSS rescore
  57. 2026-05-28 13:42 UTCEPSS rescore
  58. 2026-05-28 13:42 UTCEPSS rescore
  59. 2026-05-27 21:21 UTCEG score recompute
  60. 2026-05-27 21:21 UTCGHSA enrichment
  61. 2026-05-27 13:38 UTCEPSS rescore
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  63. 2026-05-26 13:42 UTCEPSS rescore
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  65. 2026-05-26 07:17 UTCEPSS rescore
  66. 2026-05-26 07:17 UTCEPSS rescore
  67. 2026-05-26 04:46 UTCOSV refresh

Frequently asked(5)

What is CVE-2018-12550?
CVE-2018-12550 is a high vulnerability published on March 27, 2019. When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty…
When was CVE-2018-12550 disclosed?
CVE-2018-12550 was first published in the National Vulnerability Database on March 27, 2019, 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-2018-12550 actively exploited?
CVE-2018-12550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 68.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-12550?
CVE-2018-12550 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2018-12550?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12550, 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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