CVE-2026-20212

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-02. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges. This vulnerability exists because TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and forwarding (VRF). A successful exploit could allow the attacker to connect to an affected device and send crafted input that could be executed as code with root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
No patch confirmed yet.
generic

Cisco Nexus 9000 Series Switches Silicon One Remote Code Execution Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr

Vendor Advisories for CVE-2026-20212(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 52× in last 7d / 77× 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. 2026-09-11 20:11 UTCGHSA enrichment
  2. 2026-09-11 16:08 UTCEG score recompute
  3. 2026-09-11 16:08 UTCGHSA enrichment
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-11 12:00 UTCEG score recompute
  6. 2026-09-11 12:00 UTCGHSA enrichment
  7. 2026-09-11 09:36 UTCEPSS rescore
  8. 2026-09-11 07:57 UTCGHSA enrichment
  9. 2026-09-11 03:55 UTCGHSA enrichment
  10. 2026-09-10 23:52 UTCGHSA enrichment
  11. 2026-09-10 19:45 UTCGHSA enrichment
  12. 2026-09-10 15:41 UTCGHSA enrichment
  13. 2026-09-10 11:39 UTCEG score recompute
  14. 2026-09-10 11:39 UTCGHSA enrichment
  15. 2026-09-10 09:34 UTCEPSS rescore
  16. 2026-09-10 07:36 UTCGHSA enrichment
  17. 2026-09-10 03:34 UTCGHSA enrichment
  18. 2026-09-09 23:31 UTCGHSA enrichment
  19. 2026-09-09 19:24 UTCGHSA enrichment
  20. 2026-09-09 15:22 UTCGHSA enrichment
  21. 2026-09-09 11:19 UTCGHSA enrichment
  22. 2026-09-09 07:16 UTCGHSA enrichment
  23. 2026-09-09 03:14 UTCGHSA enrichment
  24. 2026-09-08 23:12 UTCEG score recompute
  25. 2026-09-08 23:11 UTCGHSA enrichment
Show 52 more
  1. 2026-09-08 22:00 UTCEPSS rescore
  2. 2026-09-08 11:06 UTCGHSA enrichment
  3. 2026-09-08 07:01 UTCGHSA enrichment
  4. 2026-09-08 02:59 UTCGHSA enrichment
  5. 2026-09-07 22:56 UTCGHSA enrichment
  6. 2026-09-07 18:53 UTCEG score recompute
  7. 2026-09-07 18:53 UTCGHSA enrichment
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-07 14:51 UTCGHSA enrichment
  10. 2026-09-07 10:25 UTCGHSA enrichment
  11. 2026-09-07 06:22 UTCGHSA enrichment
  12. 2026-09-07 02:16 UTCGHSA enrichment
  13. 2026-09-06 22:12 UTCGHSA enrichment
  14. 2026-09-06 18:09 UTCGHSA enrichment
  15. 2026-09-06 14:07 UTCEG score recompute
  16. 2026-09-06 14:07 UTCGHSA enrichment
  17. 2026-09-06 13:47 UTCEPSS rescore
  18. 2026-09-06 10:04 UTCGHSA enrichment
  19. 2026-09-06 06:02 UTCGHSA enrichment
  20. 2026-09-06 02:00 UTCGHSA enrichment
  21. 2026-09-05 21:58 UTCGHSA enrichment
  22. 2026-09-05 17:55 UTCEG score recompute
  23. 2026-09-05 17:55 UTCGHSA enrichment
  24. 2026-09-05 13:50 UTCGHSA enrichment
  25. 2026-09-05 09:45 UTCGHSA enrichment
  26. 2026-09-05 05:43 UTCGHSA enrichment
  27. 2026-09-05 01:41 UTCGHSA enrichment
  28. 2026-09-04 21:38 UTCGHSA enrichment
  29. 2026-09-04 17:32 UTCEG score recompute
  30. 2026-09-04 17:32 UTCGHSA enrichment
  31. 2026-09-04 13:30 UTCGHSA enrichment
  32. 2026-09-04 09:22 UTCGHSA enrichment
  33. 2026-09-04 05:19 UTCEG score recompute
  34. 2026-09-04 05:19 UTCGHSA enrichment
  35. 2026-09-04 05:06 UTCEPSS rescore
  36. 2026-09-04 01:17 UTCGHSA enrichment
  37. 2026-09-03 21:13 UTCGHSA enrichment
  38. 2026-09-03 17:10 UTCEG score recompute
  39. 2026-09-03 17:10 UTCGHSA enrichment
  40. 2026-09-03 13:04 UTCGHSA enrichment
  41. 2026-09-03 08:59 UTCGHSA enrichment
  42. 2026-09-03 04:56 UTCEG score recompute
  43. 2026-09-03 04:56 UTCGHSA enrichment
  44. 2026-09-03 03:41 UTCGHSA enrichment
  45. 2026-09-02 23:36 UTCGHSA enrichment
  46. 2026-09-02 19:31 UTCGHSA enrichment
  47. 2026-09-02 18:36 UTCEG score recompute
  48. 2026-09-02 18:36 UTCGHSA enrichment
  49. 2026-09-02 18:06 UTCEG score recompute
  50. 2026-09-02 17:37 UTCEG score recompute
  51. 2026-09-02 16:33 UTCEG score recompute
  52. 2026-09-02 16:31 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-20212?
CVE-2026-20212 is a critical vulnerability published on September 2, 2026. A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges. This vulnerability exists because TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and…
When was CVE-2026-20212 disclosed?
CVE-2026-20212 was first published in the National Vulnerability Database on September 2, 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-2026-20212 actively exploited?
CVE-2026-20212 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 57.0% of all scored CVEs.
What is the CVSS score of CVE-2026-20212?
CVE-2026-20212 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-20212?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20212, 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

Explore the affected products and dependency analysis for CVE-2026-20212

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