Cisco Patches Critical Nexus 9000 Vulnerability and Releases IOS XR Hardening Update
Unauthenticated remote code execution flaw and seven umbrella CVEs addressed in concurrent security releases
Key Takeaways
- Cisco patched CVE-2026-20212, a critical unauthenticated remote code execution flaw in Nexus 9000 Silicon One-based switches (CVSS 9.8).
- An IOS XR hardening release bundles fixes for seven umbrella CVEs, including two rated 9.8, with no workarounds available for any IOS XR version.
- Affected users should apply Cisco's recommended updates immediately to mitigate the risks.
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