CVE-2026-21655

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 59% of all CVEs by exploit prediction. 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, secondary
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

Deserialization of untrusted data vulnerability in Johnson Control victor on Windows, Johnson Controls CCure 9000, and Johnson Controls Victor Application Server allows capec-586.

This issue affects victor: before 8.0; CCure 9000: before 3.2; Victor Application Server: before 4.1.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

July 23, 2026

Last Modified

August 6, 2026

Advisory Details (1)

Auto-updated Jul 23, 2026
Patch available.
generic Patch Available

Security Advisories | Johnson Controls

https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

Vendor Advisories for CVE-2026-21655(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 21× in last 7d / 91× 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 187 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-21655?
CVE-2026-21655 is a high vulnerability published on July 23, 2026. Deserialization of untrusted data vulnerability in Johnson Control victor on Windows, Johnson Controls CCure 9000, and Johnson Controls Victor Application Server allows capec-586. This issue affects victor: before 8.0; CCure 9000: before 3.2; Victor Application Server: before 4.1.
When was CVE-2026-21655 disclosed?
CVE-2026-21655 was first published in the National Vulnerability Database on July 23, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21655 actively exploited?
CVE-2026-21655 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.2% of all scored CVEs.
What is the CVSS score of CVE-2026-21655?
CVE-2026-21655 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-21655?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21655, 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

Explore the affected products and dependency analysis for CVE-2026-21655

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