Critical severity9.8NVD Advisory· Published Sep 2, 2026· Updated Sep 18, 2026
CVE-2026-20279
CVE-2026-20279
Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20279 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1Patches
Vulnerability mechanics
References
2News mentions
5- ⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and MoreThe Hacker News · Sep 7, 2026
- Cisco searched for IOS XR bugs and found so many it rolled them into an update releaseThe Register Security · Sep 4, 2026
- Critical Cisco Nexus 9000 Flaw Lets Unauthenticated Remote Attackers Run Code as RootThe Hacker News · Sep 3, 2026
- Cisco Warns of Unpatched Secure Email Flaws, Patches Critical Switch VulnerabilitiesSecurityWeek · Sep 3, 2026
- Cisco Systems: 11 Vulnerabilities Disclosed in IOS XR, Secure Email, Nexus 9000, and IP PhonesVypr Intelligence · Sep 2, 2026