CVE-2026-78011

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 integer underflow 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-2026-78011 — Fireware OS Integer Underflow in Iked Allows Unauthenticated Denial of Service (DoS)

https://psirt.watchguard.com/CVE-2026-78011

Vendor Advisories for CVE-2026-78011(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 28× in last 7d / 96× 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. 2026-09-19 18:43 UTCEG score recompute
  2. 2026-09-19 18:43 UTCGHSA enrichment
  3. 2026-09-19 07:17 UTCGHSA enrichment
  4. 2026-09-18 19:50 UTCEG score recompute
  5. 2026-09-18 19:50 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 08:24 UTCGHSA enrichment
  8. 2026-09-17 20:53 UTCEG score recompute
  9. 2026-09-17 20:53 UTCGHSA enrichment
  10. 2026-09-17 06:49 UTCGHSA enrichment
  11. 2026-09-16 19:02 UTCEG score recompute
  12. 2026-09-16 19:01 UTCGHSA enrichment
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 06:48 UTCEG score recompute
  15. 2026-09-16 06:48 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-15 19:21 UTCGHSA enrichment
  18. 2026-09-15 07:55 UTCEG score recompute
  19. 2026-09-15 07:55 UTCGHSA enrichment
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-14 20:29 UTCGHSA enrichment
  23. 2026-09-14 08:55 UTCGHSA enrichment
  24. 2026-09-13 21:29 UTCEG score recompute
  25. 2026-09-13 21:29 UTCGHSA enrichment
Show 71 more
  1. 2026-09-13 10:03 UTCGHSA enrichment
  2. 2026-09-12 22:37 UTCEG score recompute
  3. 2026-09-12 22:37 UTCGHSA enrichment
  4. 2026-09-12 11:10 UTCGHSA enrichment
  5. 2026-09-11 23:20 UTCEG score recompute
  6. 2026-09-11 23:20 UTCGHSA enrichment
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 10:52 UTCEG score recompute
  10. 2026-09-11 10:52 UTCGHSA enrichment
  11. 2026-09-10 23:17 UTCGHSA enrichment
  12. 2026-09-10 11:51 UTCEG score recompute
  13. 2026-09-10 11:51 UTCGHSA enrichment
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-09 23:57 UTCGHSA enrichment
  16. 2026-09-09 12:03 UTCGHSA enrichment
  17. 2026-09-09 00:36 UTCEG score recompute
  18. 2026-09-09 00:36 UTCGHSA enrichment
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-08 04:40 UTCGHSA enrichment
  21. 2026-09-07 17:13 UTCEG score recompute
  22. 2026-09-07 17:13 UTCGHSA enrichment
  23. 2026-09-07 05:46 UTCGHSA enrichment
  24. 2026-09-06 18:20 UTCEG score recompute
  25. 2026-09-06 18:20 UTCGHSA enrichment
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-06 06:53 UTCGHSA enrichment
  28. 2026-09-05 19:27 UTCEG score recompute
  29. 2026-09-05 19:27 UTCGHSA enrichment
  30. 2026-09-05 08:01 UTCGHSA enrichment
  31. 2026-09-04 20:34 UTCEG score recompute
  32. 2026-09-04 20:34 UTCGHSA enrichment
  33. 2026-09-04 08:56 UTCEG score recompute
  34. 2026-09-04 08:56 UTCGHSA enrichment
  35. 2026-09-04 05:07 UTCEPSS rescore
  36. 2026-09-03 21:21 UTCEG score recompute
  37. 2026-09-03 21:21 UTCGHSA enrichment
  38. 2026-09-03 20:55 UTCEG score recompute
  39. 2026-09-03 20:55 UTCGHSA enrichment
  40. 2026-09-03 14:31 UTCGHSA enrichment
  41. 2026-09-03 03:02 UTCGHSA enrichment
  42. 2026-09-02 15:35 UTCEG score recompute
  43. 2026-09-02 15:35 UTCGHSA enrichment
  44. 2026-09-02 14:12 UTCEPSS rescore
  45. 2026-09-02 04:03 UTCGHSA enrichment
  46. 2026-09-01 16:28 UTCEG score recompute
  47. 2026-09-01 16:28 UTCGHSA enrichment
  48. 2026-09-01 13:54 UTCEPSS rescore
  49. 2026-09-01 04:59 UTCEG score recompute
  50. 2026-09-01 04:59 UTCGHSA enrichment
  51. 2026-09-01 04:40 UTCEPSS rescore
  52. 2026-09-01 04:40 UTCEPSS rescore
  53. 2026-08-31 17:29 UTCGHSA enrichment
  54. 2026-08-31 05:58 UTCEG score recompute
  55. 2026-08-31 05:57 UTCGHSA enrichment
  56. 2026-08-30 19:18 UTCEPSS rescore
  57. 2026-08-30 19:17 UTCEPSS rescore
  58. 2026-08-30 18:31 UTCGHSA enrichment
  59. 2026-08-30 07:05 UTCEG score recompute
  60. 2026-08-30 07:05 UTCGHSA enrichment
  61. 2026-08-30 01:22 UTCEPSS rescore
  62. 2026-08-29 19:35 UTCGHSA enrichment
  63. 2026-08-29 08:08 UTCEG score recompute
  64. 2026-08-29 08:08 UTCGHSA enrichment
  65. 2026-08-28 21:42 UTCEPSS rescore
  66. 2026-08-28 20:37 UTCGHSA enrichment
  67. 2026-08-28 18:59 UTCGHSA enrichment
  68. 2026-08-28 13:45 UTCGHSA enrichment
  69. 2026-08-28 02:18 UTCEG score recompute
  70. 2026-08-28 02:11 UTCEG score recompute
  71. 2026-08-28 02:07 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78011?
CVE-2026-78011 is a high vulnerability published on August 27, 2026. An integer underflow 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-2026-78011 disclosed?
CVE-2026-78011 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-2026-78011 actively exploited?
CVE-2026-78011 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-2026-78011?
CVE-2026-78011 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-78011?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78011, 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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