Unauthenticated RCE in Cisco Nexus 9000 Silicon One Switches
Unauthenticated remote code execution in ten Cisco Nexus 9000 Silicon One switches via a Silicon One integration flaw. CVSS 9.8. Patches released September 3, 2026.
- Vendor
- Cisco
- Product
- Nexus 9000 Series Switches (Silicon One)
- CVSS
- 9.8
- EPSS (exploit probability)
- 0.7%
- Status
- patched
- Published
Is CVE-2026-20212 being exploited?
Not on any exploited-vulnerability catalog we track. CVE-2026-20212 was not on the CISA, ENISA or CIRCL exploited catalogs as of our 2026-10-23 snapshot. That can change quickly; check the write-up below for the latest reporting.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 0.7% (scored October 14, 2026).
- CISA KEV[ — ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-23. Full cross-catalog view: /kev-comparison
CVE-2026-20212 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
CVE-2026-20212 is a critical unauthenticated remote code execution vulnerability in the Silicon One integration layer of Cisco Nexus 9000 Series Switches. An unauthenticated, remote attacker can exploit the flaw to execute arbitrary code with root privileges. No credentials required.
Ten Silicon One-based Nexus 9000 platform IDs are confirmed affected. The Cisco PSIRT advisory, published September 3, 2026, lists the specific affected models and the patched NX-OS software versions. No workaround is available; upgrading to a fixed NX-OS build is the documented remediation path.
Cisco has not confirmed active exploitation in the wild as of initial disclosure.
Other Cisco CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-76519 Cisco Secure Email Gateway Relative Path Traversal Vulnerability | [ CRITICAL ] | 9.8 | 1.6% | |
| CVE-2026-76501 Cisco NX-OS SRv6 NGOAM unauthenticated root RCEwrite-up | [ CRITICAL ] | 9.8 | 0.5% | — |
| CVE-2026-76471 Cisco NX-OS NX-API unauthenticated root RCEwrite-up | [ CRITICAL ] | 9.8 | 0.5% | — |
| CVE-2026-76504 Cisco Catalyst SD-WAN Manager Authentication Bypasswrite-up | [ CRITICAL ] | 9.8 | 1.8% | |
| CVE-2026-76460 Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerabilitywrite-up | [ CRITICAL ] | 10.0 | 14.0% | |
| CVE-2026-76461 Cisco Secure Email Gateway SQL Injection Vulnerabilitywrite-up | [ CRITICAL ] | 9.8 | 29.5% | |
| CVE-2026-20079 Cisco FMC Authentication Bypass Enables Root OS Accesswrite-up | [ CRITICAL ] | 10.0 | 88.5% | |
| CVE-2026-20349 Cisco ASA and FTD VPN Heap Inspection Denial-of-Service Flawwrite-up | [ HIGH ] | 8.6 | 1.0% |
