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Cisco IOS XR Software Security Hardening Release: September 2026

Source: cisco / cisco-sa-hardening-iosxr-qg64NcM — original advisory

Published: 2026-09-02 · Last updated: 2026-09-02 · Vendor severity: Critical

CVEs

CVECVSSCWEExploitation
CVE-2026-20274 9.8 CWE-284: Improper Access Control Not observed in the wild
CVE-2026-20275 9.8 CWE-284: Improper Access Control Not observed in the wild
CVE-2026-20276 9.8 CWE-284: Improper Access Control Not observed in the wild
CVE-2026-20277 9.8 CWE-284: Improper Access Control Not observed in the wild
CVE-2026-20278 9.8 CWE-284: Improper Access Control Not observed in the wild
CVE-2026-20279 9.8 CWE-284: Improper Access Control Not observed in the wild
CVE-2026-20280 9.8 CWE-284: Improper Access Control Not observed in the wild

Affected Products

ProductAffected versionsFixed version
Cisco IOS XR Software 2.0.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.2.11 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.2.20 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.2.21 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.3.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.3.20 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.3.30 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.4.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.4.10 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.4.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.4.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 24.4.30 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.1.30 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.2.30 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.3.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.4.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.4.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.4.201 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 25.4.30 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 26.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 26.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 26.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 26.2.100 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 26.2.101 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.0.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.0.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.2.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.2.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.2.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.2.50 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.2.6 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.3.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.3.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.3.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.3.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.4.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.4.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.4.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.4.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.5.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.5.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.5.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.5.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.6.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.6.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.6.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.6.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.7.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.7.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.7.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.7.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.8.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.8.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.8.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.8.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.8.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.9.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.9.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.9.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 3.9.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.0.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.0.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.0.11 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.0.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.0.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.0.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.1.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.2.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.2.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.2.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.3.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.3.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.3.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 4.3.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.0.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.0.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.11 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.12 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.1.K9SEC Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.1.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.21 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.47 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.5 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.2.6 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.3.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.3.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.3.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.3.31 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 5.3.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.0.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.0.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.0.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.0.2.01 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.11 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.12 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.21 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.22 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.31 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.32 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.33 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.36 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.42 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.1.45 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.11 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.25 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.8 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.2.9 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.3.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.3.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.3.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.3.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.4.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.4.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.4.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.4.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.4.9999 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.25 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.26 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.28 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.29 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.31 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.32 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.33 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.35 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.351 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.352 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.353 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.36 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.90 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.92 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.5.93 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.11 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.12 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.25 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.406 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.560 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.6.90 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.7.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.7.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.7.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.7.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.7.35 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.7.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.8.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.8.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.9.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 6.9.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.11 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.12 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.14 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.208 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.213 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.216 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.219 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.220 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.0.90 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.10.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.10.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.11.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.119 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.11.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.11.21 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.122 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.25 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.1.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.2.0 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.2.12 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.2.141 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.16 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.27 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.5 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.3.6 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.4.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.4.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.4.16 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.4.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.5.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.5.12 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.5.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.5.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.5.4 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.5.5 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.6.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.6.15 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.6.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.6.3 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.7.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.7.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.7.21 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.8.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.8.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.8.22 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.8.23 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.9.1 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.9.2 Not specified by vendor Not specified by vendor
Cisco IOS XR Software 7.9.21 Not specified by vendor Not specified by vendor
Cisco IOS XR Software Base Not specified by vendor Not specified by vendor