CVE-2026-20359

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. 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 Crosswork engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities trackled by CVE-2026-20359 are related to insufficiently protected credentials issues that are grouped under the Common Weakness Enumeration (CWE) CWE-522.

CVSS v3
9.9
EG Score
9.9(medium)
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
30%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 20, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification
generic🔴 Active Exploitation

Cisco Crosswork Security Hardening Release: August 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-crosswork-UzDTU9Vh

Vendor Advisories for CVE-2026-20359(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 51× in last 7d / 221× 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 233 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-20359?
CVE-2026-20359 is a critical vulnerability published on August 19, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Crosswork engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The…
When was CVE-2026-20359 disclosed?
CVE-2026-20359 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20359 actively exploited?
CVE-2026-20359 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 70.4% of all scored CVEs.
What is the CVSS score of CVE-2026-20359?
CVE-2026-20359 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-20359?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20359, 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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