CVE-2026-20304

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-05. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.9Exploit: None knownExposed: 0

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

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20304 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity99% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Aug 14, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

Cisco Catalyst SD-WAN Software Security Hardening Release: August 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K

Vendor Advisories for CVE-2026-20304(2)

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 53× in last 7d / 126× 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 126 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20304?
CVE-2026-20304 is a critical vulnerability published on August 5, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that address multiple internally discovered vulnerabilities. The…
When was CVE-2026-20304 disclosed?
CVE-2026-20304 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20304 actively exploited?
CVE-2026-20304 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 80.8% of all scored CVEs.
What is the CVSS score of CVE-2026-20304?
CVE-2026-20304 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-20304?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20304, 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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