CVE-2026-21404

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

Score 6.3 from GitHub Security Advisory published 2026-06-04. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.3Exploit: NoneExposed: 0

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

NAVTOR NavBox through version 4.16.1.20 contains hard-coded credentials within its Windows Communication Foundation (SOAP) implementation. If the SOAP functionality is enabled, a local attacker can extract credentials to bypass the intended transfer workflow. Successful authentication against the SOAP interface grants access to privileged WCF methods, enabling an attacker to write or overwrite files within application-defined paths.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
2.3%
KEV
Not listed

Published

June 4, 2026

Last Modified

July 22, 2026

Advisory Details (2)

Auto-updated Jun 14, 2026
Patch available. Sources: cisa.
generic

CSAF/csaf_files/OT/white/2026/icsa-26-155-01.json at develop · cisagov/CSAF · GitHub

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-155-01.json
cisa Patch Available

NAVTOR NavBox | CISA

https://www.cisa.gov/news-events/ics-advisories/icsa-26-155-01

Vendor Advisories for CVE-2026-21404(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-21404?
CVE-2026-21404 is a medium vulnerability published on June 4, 2026. NAVTOR NavBox through version 4.16.1.20 contains hard-coded credentials within its Windows Communication Foundation (SOAP) implementation. If the SOAP functionality is enabled, a local attacker can extract credentials to bypass the intended transfer workflow. Successful authentication against the…
When was CVE-2026-21404 disclosed?
CVE-2026-21404 was first published in the National Vulnerability Database on June 4, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21404 actively exploited?
CVE-2026-21404 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-21404?
CVE-2026-21404 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-21404?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21404, 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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