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Critical Cisco Nexus 9000 Flaw Lets Unauthenticated Remote Attackers Run Code as Root

The Hacker News
iOSCVEAppleCiscoVulnerabilityUpdateCritical

Overview

Cisco has issued critical patches for a vulnerability in its Nexus 9000 series switches, specifically those based on Silicon One architecture. This flaw, identified as CVE-2026-20212, carries a CVSS score of 9.8, indicating a severe risk. It allows remote attackers, without needing to authenticate, to execute code with root privileges on impacted systems. Alongside this vulnerability, Cisco also released a hardening update for IOS XR that includes seven additional CVEs, two of which are also rated very high at 9.8. Users of these Nexus switches should prioritize applying the patches as there are currently no workarounds available for the IOS XR versions affected.

Key Takeaways

  • Affected Systems: Cisco Nexus 9000 switches based on Silicon One architecture; IOS XR versions affected by CVEs.
  • Action Required: Cisco has released patches to address CVE-2026-20212 and the associated IOS XR vulnerabilities.
  • Timeline: Disclosed on [specific date not provided in article]

Original Article Summary

Cisco has released patches to address a critical security flaw affecting 10 Silicon One-based Nexus 9000 switches that could allow an unauthenticated, remote attacker to execute code as root, alongside an IOS XR hardening release bundling 7 umbrella CVEs, 2 of which are rated 9.8, with no workaround for any IOS XR version. The Nexus vulnerability, tracked as CVE-2026-20212 (CVSS score: 9.8), is

Impact

Cisco Nexus 9000 switches based on Silicon One architecture; IOS XR versions affected by CVEs.

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Disclosed on [specific date not provided in article]

Remediation

Cisco has released patches to address CVE-2026-20212 and the associated IOS XR vulnerabilities. Users should apply these patches immediately as no workarounds are available for the IOS XR versions.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to iOS, CVE, Apple, and 4 more.

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