CVE-2026-8247

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-03. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: 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 Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code.

This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

July 3, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Jul 7, 2026
No patch confirmed yet.
generic

WatchGuard Firebox admd Out of Bounds Write Vulnerability | WatchGuard Technologies

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026

Vendor Advisories for CVE-2026-8247(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 8× in last 7d / 81× 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 206 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-08 22:01 UTCEPSS rescore
  3. 2026-09-06 14:18 UTCEG score recompute
  4. 2026-09-06 14:18 UTCGHSA enrichment
  5. 2026-09-06 13:48 UTCEPSS rescore
  6. 2026-09-05 23:50 UTCEG score recompute
  7. 2026-09-05 23:50 UTCGHSA enrichment
  8. 2026-09-05 15:31 UTCEPSS rescore
  9. 2026-09-04 05:07 UTCEPSS rescore
  10. 2026-09-02 14:12 UTCEPSS rescore
  11. 2026-09-01 13:54 UTCEPSS rescore
  12. 2026-09-01 04:40 UTCEPSS rescore
  13. 2026-08-30 23:27 UTCEG score recompute
  14. 2026-08-30 23:27 UTCGHSA enrichment
  15. 2026-08-30 19:18 UTCEPSS rescore
  16. 2026-08-30 19:17 UTCEPSS rescore
  17. 2026-08-30 11:21 UTCEG score recompute
  18. 2026-08-30 11:21 UTCGHSA enrichment
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:42 UTCEPSS rescore
  21. 2026-08-28 00:39 UTCGHSA enrichment
  22. 2026-08-27 23:29 UTCGHSA enrichment
  23. 2026-08-27 22:13 UTCEG score recompute
  24. 2026-08-27 22:13 UTCGHSA enrichment
  25. 2026-08-27 14:25 UTCEPSS rescore
Show 75 more
  1. 2026-08-26 14:47 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-25 13:39 UTCGHSA enrichment
  4. 2026-08-24 22:19 UTCEG score recompute
  5. 2026-08-24 22:19 UTCGHSA enrichment
  6. 2026-08-24 14:18 UTCEPSS rescore
  7. 2026-08-24 10:14 UTCEG score recompute
  8. 2026-08-24 10:14 UTCGHSA enrichment
  9. 2026-08-23 19:33 UTCGHSA enrichment
  10. 2026-08-23 07:28 UTCEG score recompute
  11. 2026-08-23 07:28 UTCGHSA enrichment
  12. 2026-08-23 07:26 UTCGHSA enrichment
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-22 19:20 UTCGHSA enrichment
  15. 2026-08-22 06:02 UTCEG score recompute
  16. 2026-08-22 06:02 UTCGHSA enrichment
  17. 2026-08-21 23:49 UTCEPSS rescore
  18. 2026-08-21 17:14 UTCGHSA enrichment
  19. 2026-08-21 04:26 UTCEG score recompute
  20. 2026-08-21 04:26 UTCGHSA enrichment
  21. 2026-08-20 22:56 UTCEPSS rescore
  22. 2026-08-20 16:05 UTCGHSA enrichment
  23. 2026-08-20 03:59 UTCEG score recompute
  24. 2026-08-20 03:59 UTCGHSA enrichment
  25. 2026-08-19 17:04 UTCEPSS rescore
  26. 2026-08-19 09:18 UTCGHSA enrichment
  27. 2026-08-18 20:53 UTCEG score recompute
  28. 2026-08-18 20:52 UTCGHSA enrichment
  29. 2026-08-18 13:49 UTCEPSS rescore
  30. 2026-08-18 13:49 UTCEPSS rescore
  31. 2026-08-18 04:28 UTCEG score recompute
  32. 2026-08-18 04:28 UTCGHSA enrichment
  33. 2026-08-17 13:47 UTCEPSS rescore
  34. 2026-08-17 13:40 UTCGHSA enrichment
  35. 2026-08-17 01:35 UTCEG score recompute
  36. 2026-08-17 01:35 UTCGHSA enrichment
  37. 2026-08-16 14:56 UTCEPSS rescore
  38. 2026-08-16 14:56 UTCEPSS rescore
  39. 2026-08-16 13:30 UTCEG score recompute
  40. 2026-08-16 13:30 UTCGHSA enrichment
  41. 2026-08-16 02:15 UTCEPSS rescore
  42. 2026-08-16 01:22 UTCGHSA enrichment
  43. 2026-08-15 13:16 UTCEG score recompute
  44. 2026-08-15 13:16 UTCGHSA enrichment
  45. 2026-08-15 01:31 UTCEPSS rescore
  46. 2026-08-15 01:11 UTCGHSA enrichment
  47. 2026-08-14 13:06 UTCGHSA enrichment
  48. 2026-08-14 07:38 UTCEG score recompute
  49. 2026-08-14 07:38 UTCGHSA enrichment
  50. 2026-08-13 22:00 UTCEPSS rescore
  51. 2026-08-13 19:33 UTCEG score recompute▲ 1.10
  52. 2026-08-13 19:33 UTCGHSA enrichment
  53. 2026-08-13 19:32 UTCNVD updateCVSS v3 → 8.8
  54. 2026-08-13 08:56 UTCGHSA enrichment
  55. 2026-08-12 20:51 UTCEG score recompute
  56. 2026-08-12 20:51 UTCGHSA enrichment
  57. 2026-08-12 13:51 UTCEPSS rescore
  58. 2026-08-12 08:46 UTCGHSA enrichment
  59. 2026-08-11 20:41 UTCEG score recompute
  60. 2026-08-11 20:41 UTCGHSA enrichment
  61. 2026-08-11 13:43 UTCEPSS rescore
  62. 2026-08-11 08:36 UTCEG score recompute
  63. 2026-08-11 08:36 UTCGHSA enrichment
  64. 2026-08-11 00:00 UTCEPSS rescore
  65. 2026-08-10 20:31 UTCEG score recompute
  66. 2026-08-10 20:31 UTCGHSA enrichment
  67. 2026-08-10 19:20 UTCEG score recompute
  68. 2026-08-10 19:20 UTCGHSA enrichment
  69. 2026-08-10 17:00 UTCGHSA enrichment
  70. 2026-08-10 04:55 UTCGHSA enrichment
  71. 2026-08-09 16:50 UTCEG score recompute
  72. 2026-08-09 16:50 UTCGHSA enrichment
  73. 2026-08-09 13:47 UTCEPSS rescore
  74. 2026-08-09 04:45 UTCGHSA enrichment
  75. 2026-08-08 16:40 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8247?
CVE-2026-8247 is a high vulnerability published on July 3, 2026. An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and…
When was CVE-2026-8247 disclosed?
CVE-2026-8247 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8247 actively exploited?
CVE-2026-8247 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 81.2% of all scored CVEs.
What is the CVSS score of CVE-2026-8247?
CVE-2026-8247 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-8247?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8247, 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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