CVE-2026-20279
Cisco IOS XR Software Security Hardening Release: September 2026
CVSS Score
9.8
EPSS Score
0.3%
EPSS Percentile
23th
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.
| CWE | CWE-284 |
| Vendor | cisco |
| Product | cisco ios xr software |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Sep 2, 2026 |
| Last Updated | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Cisco / Cisco IOS XR Software
6.5.29 7.0.1 6.5.26 6.5.25 6.5.28 6.5.90 7.1.1 7.0.90 6.7.1 7.0.2 7.1.15 7.2.1 7.1.2 6.7.2 7.0.11 7.0.12 7.0.14 7.1.25 7.2.12 7.3.1 7.1.3 6.7.3 7.4.1 7.2.2 6.7.4 6.5.31 7.3.15 7.3.16 6.8.1 7.4.15 6.5.32 7.3.2 7.5.1 7.4.16 7.3.27 7.6.1 7.5.2 7.8.1 7.6.15 7.5.12 7.8.12 7.3.3 7.7.1 6.8.2 7.3.4 7.4.2 6.7.35 6.9.1 7.6.2 7.5.3 7.7.2 6.9.2 7.9.1 7.10.1 7.8.2 7.5.4 6.5.33 7.8.22 7.7.21 7.9.2 7.3.5 7.5.5 7.11.1 7.9.21 7.10.2 24.1.1 7.6.3 7.3.6 7.5.52 7.11.2 24.2.1 24.1.2 24.2.11 24.3.1 24.4.1 24.2.2 7.8.23 7.11.21 24.2.20 24.3.2 24.4.10 6.5.35 25.1.1 24.4.2 24.3.20 24.4.15 25.2.1 6.5.351 25.1.2 24.3.30 25.3.1 6.5.352 24.4.30 24.2.21 25.4.1 25.2.2 25.2.15 7.2.0 7.0.0 25.2.30 6.5.353 26.1.1 25.1.30 25.3.15 26.2.100 25.4.2 26.2.1 25.4.30 26.1.2 25.4.201 26.2.101 25.2.21