Vulnerability intelligence

CVE-2026-20279

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.

CVSS Score

9.8

Critical

EPSS — Exploit Probability

0.0%

Riskier than 0% of all CVEs

Exploitation

Not in CISA KEV

No federal exploitation record

Remediation

unknown

Check vendor advisories

NVD entry PoC / advisory

1 article across 1 outlet · first covered Sep 3, 2026 · latest Sep 3, 2026

Coverage timeline

Cisco Fixes Critical Cisco IOS XR Vulnerabilities
securityonline.info · Sep 3, 2026