CVE-2026-78009

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 75% 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
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

August 27, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

CVE-2026-78009 — Fireware OS Out-of-Bounds Read in iked Allows Unauthenticated Denial of Service (DoS)

https://psirt.watchguard.com/CVE-2026-78009

Vendor Advisories for CVE-2026-78009(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 91× 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. 2026-09-20 01:56 UTCEG score recompute
  2. 2026-09-20 01:56 UTCGHSA enrichment
  3. 2026-09-19 13:27 UTCGHSA enrichment
  4. 2026-09-19 00:58 UTCEG score recompute
  5. 2026-09-19 00:58 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 12:30 UTCGHSA enrichment
  8. 2026-09-18 00:02 UTCEG score recompute
  9. 2026-09-18 00:02 UTCGHSA enrichment
  10. 2026-09-17 10:12 UTCGHSA enrichment
  11. 2026-09-16 21:43 UTCEG score recompute
  12. 2026-09-16 21:43 UTCGHSA enrichment
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 09:14 UTCEG score recompute
  15. 2026-09-16 09:14 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-15 19:45 UTCGHSA enrichment
  18. 2026-09-15 07:16 UTCEG score recompute
  19. 2026-09-15 07:16 UTCGHSA enrichment
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-14 18:47 UTCGHSA enrichment
  23. 2026-09-14 05:27 UTCGHSA enrichment
  24. 2026-09-13 16:59 UTCEG score recompute
  25. 2026-09-13 16:59 UTCGHSA enrichment
Show 66 more
  1. 2026-09-13 04:30 UTCGHSA enrichment
  2. 2026-09-12 16:01 UTCEG score recompute
  3. 2026-09-12 16:01 UTCGHSA enrichment
  4. 2026-09-12 03:32 UTCGHSA enrichment
  5. 2026-09-11 15:03 UTCEG score recompute
  6. 2026-09-11 15:03 UTCGHSA enrichment
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 02:35 UTCGHSA enrichment
  10. 2026-09-10 14:05 UTCEG score recompute
  11. 2026-09-10 14:05 UTCGHSA enrichment
  12. 2026-09-10 09:35 UTCEPSS rescore
  13. 2026-09-10 01:34 UTCGHSA enrichment
  14. 2026-09-09 13:06 UTCGHSA enrichment
  15. 2026-09-09 00:36 UTCEG score recompute
  16. 2026-09-09 00:36 UTCGHSA enrichment
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-08 03:33 UTCGHSA enrichment
  19. 2026-09-07 15:04 UTCGHSA enrichment
  20. 2026-09-07 01:29 UTCEG score recompute
  21. 2026-09-07 01:29 UTCGHSA enrichment
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 13:00 UTCGHSA enrichment
  24. 2026-09-06 00:32 UTCEG score recompute
  25. 2026-09-06 00:32 UTCGHSA enrichment
  26. 2026-09-05 12:03 UTCGHSA enrichment
  27. 2026-09-04 23:32 UTCEG score recompute
  28. 2026-09-04 23:32 UTCGHSA enrichment
  29. 2026-09-04 09:54 UTCEG score recompute
  30. 2026-09-04 09:53 UTCGHSA enrichment
  31. 2026-09-04 05:07 UTCEPSS rescore
  32. 2026-09-03 21:22 UTCEG score recompute
  33. 2026-09-03 21:22 UTCGHSA enrichment
  34. 2026-09-03 20:55 UTCEG score recompute
  35. 2026-09-03 20:55 UTCGHSA enrichment
  36. 2026-09-03 14:01 UTCGHSA enrichment
  37. 2026-09-03 01:32 UTCEG score recompute
  38. 2026-09-03 01:32 UTCGHSA enrichment
  39. 2026-09-02 14:12 UTCEPSS rescore
  40. 2026-09-02 13:02 UTCGHSA enrichment
  41. 2026-09-02 00:34 UTCEG score recompute
  42. 2026-09-02 00:34 UTCGHSA enrichment
  43. 2026-09-01 13:54 UTCEPSS rescore
  44. 2026-09-01 12:04 UTCEG score recompute
  45. 2026-09-01 12:03 UTCGHSA enrichment
  46. 2026-09-01 04:40 UTCEPSS rescore
  47. 2026-09-01 04:40 UTCEPSS rescore
  48. 2026-08-31 23:34 UTCGHSA enrichment
  49. 2026-08-31 11:06 UTCGHSA enrichment
  50. 2026-08-30 22:36 UTCEG score recompute
  51. 2026-08-30 22:36 UTCGHSA enrichment
  52. 2026-08-30 19:18 UTCEPSS rescore
  53. 2026-08-30 19:17 UTCEPSS rescore
  54. 2026-08-30 10:07 UTCEG score recompute
  55. 2026-08-30 10:07 UTCGHSA enrichment
  56. 2026-08-30 01:22 UTCEPSS rescore
  57. 2026-08-29 21:39 UTCGHSA enrichment
  58. 2026-08-29 09:11 UTCEG score recompute
  59. 2026-08-29 09:11 UTCGHSA enrichment
  60. 2026-08-28 21:42 UTCEPSS rescore
  61. 2026-08-28 20:38 UTCGHSA enrichment
  62. 2026-08-28 18:59 UTCGHSA enrichment
  63. 2026-08-28 14:54 UTCGHSA enrichment
  64. 2026-08-28 02:18 UTCEG score recompute
  65. 2026-08-28 02:12 UTCEG score recompute
  66. 2026-08-28 02:07 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78009?
CVE-2026-78009 is a high vulnerability published on August 27, 2026. An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.
When was CVE-2026-78009 disclosed?
CVE-2026-78009 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78009 actively exploited?
CVE-2026-78009 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 74.6% of all scored CVEs.
What is the CVSS score of CVE-2026-78009?
CVE-2026-78009 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-78009?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78009, 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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