CVE-2026-51537

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: Elevated riskExposed: 0

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

EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of ForwardOpen requests when processing short malformed packets. An attacker can send a valid ENIP outer frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request, causing the parser to continue reading fields even when request data is insufficient. This issue is remotely triggerable via network traffic and does not require authentication.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
72(Attend)
EG Risk 72/100SSVC: Attend

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
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

July 13, 2026

Last Modified

August 11, 2026

Advisory Details (2)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

Stack Out-of-Bounds Read in ForwardOpen Parsing · Issue #564 · EIPStackGroup/OpENer · GitHub

https://github.com/EIPStackGroup/OpENer/issues/564
generic

CVE-2026-51537 · GitHub

https://gist.github.com/MrAlaskan/a5fb0fb7765c9df80d28220ed558f04e

Vendor Advisories for CVE-2026-51537(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 33× in last 7d / 217× 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 279 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51537?
CVE-2026-51537 is a critical vulnerability published on July 13, 2026. EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of ForwardOpen requests when processing short malformed packets. An attacker can send a valid ENIP outer frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request, causing the parser…
When was CVE-2026-51537 disclosed?
CVE-2026-51537 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51537 actively exploited?
CVE-2026-51537 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 60.6% of all scored CVEs.
What is the CVSS score of CVE-2026-51537?
CVE-2026-51537 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51537?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51537, 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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