CVE-2026-63033

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-31. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
60
EG Risk 60/100CISA 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
Severity65% × 45%
Exploitation40% × 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
37th
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 public PoC (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 (3)

Auto-updated Jul 30, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github, cisa.
cisa Patch Available🔴 Active Exploitation

MZ Automation lib60870 | CISA

MZ Automation lib60870 | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-11
github Patch Available🟡 PoC Available

Heap-buffer-overflow in InformationObject_ParseObjectAddress (cs101_information_objects.c:241) · Advisory · mz-automation/lib60870 · GitHub

https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7
generic

CSAF/csaf_files/OT/white/2026/icsa-26-211-11.json at develop · cisagov/CSAF · GitHub

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-11.json

Vendor Advisories for CVE-2026-63033(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 13× in last 7d / 57× 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 155 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63033?
CVE-2026-63033 is a medium vulnerability published on July 30, 2026. A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.
When was CVE-2026-63033 disclosed?
CVE-2026-63033 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-2026-63033 actively exploited?
CVE-2026-63033 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63033?
CVE-2026-63033 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63033?
A fix for CVE-2026-63033 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63033 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-63033

Explore →

Is Your Infrastructure Affected by CVE-2026-63033?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs