Improper Access Control in Cisco IOS XR Software
CVE-2026-20279

9.8CRITICAL

Key Information:

Vendor

Cisco
Status
Cisco iOS Xr Software
Vendor
CVE Published:
2 September 2026

Badges

👾 Exploit Exists📰 News Worthy

What is CVE-2026-20279?

Cisco IOS XR Software has been identified with vulnerabilities related to improper access control, which can potentially allow unauthorized interactions with system functionalities. This issue falls under the Common Weakness Enumeration category of CWE-284, emphasizing the necessity for stringent access management principles in software design. Cisco has responded with a series of software hardening releases to fortify the product against such vulnerabilities, showcasing their commitment to product quality and proactive security measures.

Affected Version(s)

Cisco IOS XR Software 6.5.29

Cisco IOS XR Software 7.0.1

Cisco IOS XR Software 6.5.26

News Articles

favicon imageSwapupdate

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

Cisco has released patches to address a critical security flaw affecting 10 Silicon One-based Nexus 9000 switches that could allow an unauthenticated, remote

3 weeks ago

favicon imageThe Hacker News

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

Cisco patches a Nexus 9000 flaw enabling unauthenticated remote root code execution and seven IOS XR umbrella CVEs affecting every release.

3 weeks ago

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 📰

    First article discovered by The Hacker News

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.