CVE-2026-9636

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 88% 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
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

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

A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL). This could allow a network-based attacker to establish a connection using a certificate that should be untrusted, potentially bypassing CIP Security protections.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 14, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
No patch confirmed yet.
generic

SD1788 | Security Advisory | Rockwell Automation | US

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1788.html

Vendor Advisories for CVE-2026-9636(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 20× in last 7d / 108× 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 146 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9636?
CVE-2026-9636 is a high vulnerability published on July 14, 2026. A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been…
When was CVE-2026-9636 disclosed?
CVE-2026-9636 was first published in the National Vulnerability Database on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9636 actively exploited?
CVE-2026-9636 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 88.1% of all scored CVEs.
What is the CVSS score of CVE-2026-9636?
CVE-2026-9636 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-9636?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9636, 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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