CVE-2018-6333

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 2.3% (82nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.3%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The hhvm-attach deep link handler in Nuclide did not properly sanitize the provided hostname parameter when rendering. As a result, a malicious URL could be used to render HTML and other content inside of the editor's context, which could potentially be chained to lead to code execution. This issue affected Nuclide prior to v0.290.0.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100CISA SSVC

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
Severity98% × 45%
Exploitation2% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.3%
EPSS %ILE
82nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

December 31, 2018

Last Modified

May 6, 2025

Advisory Details (1)

Auto-updated Oct 2, 2026
Patch available. Sources: github_commit.
github_commit Patch Available

commit 65f6bbd68340 (facebook/nuclide)

Patch available: facebook/nuclide v0.299.0 (contains commit 65f6bbd68340)

https://github.com/facebook/nuclide/commit/65f6bbd683404be1bb569b8d1be84b5d4c74a324

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
nuclide—
  • every version up to 0.290.0: fixed in 0.290.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 24× 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 159 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2018-6333?
CVE-2018-6333 is a critical vulnerability published on December 31, 2018. The hhvm-attach deep link handler in Nuclide did not properly sanitize the provided hostname parameter when rendering. As a result, a malicious URL could be used to render HTML and other content inside of the editor's context, which could potentially be chained to lead to code execution. This issue…
When was CVE-2018-6333 disclosed?
CVE-2018-6333 was first published on December 31, 2018, with the most recent update on May 6, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-6333 actively exploited?
CVE-2018-6333 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.3% probability of exploitation in the next 30 days (82nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-6333?
CVE-2018-6333 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-6333?
A fix for CVE-2018-6333 is available: update to the fixed version the vendor names in its advisory.

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