CVE-2026-66360

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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%CVSS: 7.5Exploit: None knownExposed: 0

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

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
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

July 30, 2026

Last Modified

July 31, 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 28× in last 7d / 86× 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. 2026-08-20 14:23 UTCGHSA enrichment
  2. 2026-08-20 01:58 UTCEG score recompute
  3. 2026-08-20 01:58 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 14:41 UTCGHSA enrichment
  6. 2026-08-19 03:25 UTCGHSA enrichment
  7. 2026-08-18 15:52 UTCEG score recompute
  8. 2026-08-18 15:52 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 03:49 UTCGHSA enrichment
  11. 2026-08-17 16:33 UTCEG score recompute
  12. 2026-08-17 16:33 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 04:57 UTCGHSA enrichment
  15. 2026-08-16 17:41 UTCEG score recompute
  16. 2026-08-16 17:41 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 06:12 UTCEG score recompute
  19. 2026-08-16 06:12 UTCGHSA enrichment
  20. 2026-08-15 18:56 UTCGHSA enrichment
  21. 2026-08-15 07:40 UTCEG score recompute
  22. 2026-08-15 07:40 UTCGHSA enrichment
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 20:23 UTCGHSA enrichment
  25. 2026-08-14 09:07 UTCEG score recompute
Show 61 more
  1. 2026-08-14 09:07 UTCGHSA enrichment
  2. 2026-08-13 22:00 UTCEPSS rescore
  3. 2026-08-13 21:51 UTCGHSA enrichment
  4. 2026-08-13 10:35 UTCGHSA enrichment
  5. 2026-08-12 23:19 UTCEG score recompute
  6. 2026-08-12 23:19 UTCGHSA enrichment
  7. 2026-08-12 13:51 UTCEPSS rescore
  8. 2026-08-12 12:03 UTCGHSA enrichment
  9. 2026-08-12 00:46 UTCEG score recompute
  10. 2026-08-12 00:46 UTCGHSA enrichment
  11. 2026-08-11 13:31 UTCGHSA enrichment
  12. 2026-08-11 02:15 UTCEG score recompute
  13. 2026-08-11 02:15 UTCGHSA enrichment
  14. 2026-08-11 00:00 UTCEPSS rescore
  15. 2026-08-10 14:59 UTCGHSA enrichment
  16. 2026-08-10 03:42 UTCGHSA enrichment
  17. 2026-08-09 16:26 UTCEG score recompute
  18. 2026-08-09 16:26 UTCGHSA enrichment
  19. 2026-08-09 13:47 UTCEPSS rescore
  20. 2026-08-09 05:11 UTCGHSA enrichment
  21. 2026-08-08 17:55 UTCGHSA enrichment
  22. 2026-08-08 06:39 UTCGHSA enrichment
  23. 2026-08-07 19:23 UTCEG score recompute
  24. 2026-08-07 19:23 UTCGHSA enrichment
  25. 2026-08-07 08:07 UTCGHSA enrichment
  26. 2026-08-06 20:50 UTCEG score recompute
  27. 2026-08-06 20:50 UTCGHSA enrichment
  28. 2026-08-06 13:47 UTCEPSS rescore
  29. 2026-08-06 09:34 UTCGHSA enrichment
  30. 2026-08-05 22:18 UTCEG score recompute
  31. 2026-08-05 22:18 UTCGHSA enrichment
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-05 11:02 UTCGHSA enrichment
  35. 2026-08-04 23:43 UTCEG score recompute
  36. 2026-08-04 23:43 UTCGHSA enrichment
  37. 2026-08-04 15:10 UTCEPSS rescore
  38. 2026-08-04 12:27 UTCEG score recompute
  39. 2026-08-04 12:27 UTCGHSA enrichment
  40. 2026-08-04 10:39 UTCEPSS rescore
  41. 2026-08-03 23:17 UTCGHSA enrichment
  42. 2026-08-03 12:01 UTCEG score recompute
  43. 2026-08-03 12:01 UTCGHSA enrichment
  44. 2026-08-03 10:36 UTCEPSS rescore
  45. 2026-08-03 00:45 UTCGHSA enrichment
  46. 2026-08-02 13:29 UTCEG score recompute
  47. 2026-08-02 13:29 UTCGHSA enrichment
  48. 2026-08-02 02:27 UTCEPSS rescore
  49. 2026-08-02 02:13 UTCGHSA enrichment
  50. 2026-08-01 14:57 UTCEG score recompute
  51. 2026-08-01 14:57 UTCGHSA enrichment
  52. 2026-08-01 04:16 UTCEPSS rescore
  53. 2026-08-01 03:41 UTCEG score recompute
  54. 2026-08-01 03:41 UTCGHSA enrichment
  55. 2026-07-31 16:24 UTCEG score recompute
  56. 2026-07-31 16:24 UTCGHSA enrichment
  57. 2026-07-31 10:38 UTCEG score recompute
  58. 2026-07-31 10:38 UTCGHSA enrichment
  59. 2026-07-30 23:20 UTCEG score recompute
  60. 2026-07-30 22:47 UTCEG score recompute
  61. 2026-07-30 22:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on July 30, 2026, with the most recent update on July 31, 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% probability of exploitation in the next 30 days, which ranks it in the top 79.6% of all scored CVEs.
What is the CVSS score of CVE-2026-66360?
CVE-2026-66360 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-66360?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66360, 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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