CVE-2026-20279
Cisco IOS XR Software Security Hardening Release: September 2026
Severity
Critical 9.8
CVSS 3.1
Exploited
Not listed
EPSS
0.003
23.0th percentile
Discovered by
Vendor
Vendor-published field
Published
Sep 2, 2026
Assigned by cisco
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.
Weakness: CWE-284
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco IOS XR Software | Routing & Switching | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco IOS XR Software