CVE-2026-20357

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 10.0Exploit: 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 tracked by CVE-2026-20357 are related to missing authentication for critical function issues that are grouped under the Common Weakness Enumeration (CWE) CWE-306.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity100% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 21, 2026

Advisory Details (2)

Auto-updated Sep 18, 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-2026-20357(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 / 216× 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 228 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-20357?
CVE-2026-20357 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-2026-20357 disclosed?
CVE-2026-20357 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20357 actively exploited?
CVE-2026-20357 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.2% of all scored CVEs.
What is the CVSS score of CVE-2026-20357?
CVE-2026-20357 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-20357?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20357, 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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