CVE-2026-66360

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-31. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The ISO Presentation layer contains a flaw in the handling of specific parameters during normal mode negotiation. A missing length check in the processing of the encoded presentation data allows an attacker controlled field with a zero length value to trigger a bounded heap over read. This condition occurs before MMS session establishment, a crafted TCP/102 connection attempt can trigger the issue. The resulting over read causes the process to terminate, leading to a denial of service condition.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity75% × 45%
Exploitation0% × 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
0.5%
EPSS %ILE
39th
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 partial (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

July 30, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
generic

CSAF/csaf_files/OT/white/2026/icsa-26-211-10.json at develop · cisagov/CSAF · GitHub

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json
cisa Patch Available🔴 Active Exploitation

MZ Automation GmbH libiec61850 | CISA

MZ Automation GmbH libiec61850 | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10

Vendor Advisories for CVE-2026-66360(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 16× in last 7d / 77× 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 212 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-66360?
CVE-2026-66360 is a high vulnerability published on July 30, 2026. The ISO Presentation layer contains a flaw in the handling of specific parameters during normal mode negotiation. A missing length check in the processing of the encoded presentation data allows an attacker controlled field with a zero length value to trigger a bounded heap over read. This…
When was CVE-2026-66360 disclosed?
CVE-2026-66360 was first published on July 30, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66360 actively exploited?
CVE-2026-66360 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66360?
CVE-2026-66360 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66360?
A fix for CVE-2026-66360 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66360 are linked in the Vendor Advisories panel on this page.

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