by Kastro
Paper/Archive/CVE-2026-20279

CVE-2026-20279

Cisco Cisco IOS XR Software — Cisco IOS XR Software Security Hardening Release: September 2026

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 42.2.422 × 208.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Cisco IOS XR Software6.5.29–CNA
Cisco IOS XR Software7.0.1–CNA
Cisco IOS XR Software6.5.26–CNA
Cisco IOS XR Software6.5.25–CNA
Cisco IOS XR Software6.5.28–CNA
Cisco IOS XR Software6.5.90–CNA
Cisco IOS XR Software7.1.1–CNA
Cisco IOS XR Software7.0.90–CNA
Cisco IOS XR Software6.7.1–CNA
Cisco IOS XR Software7.0.2–CNA
Cisco IOS XR Software7.1.15–CNA
Cisco IOS XR Software7.2.1–CNA

Scores by source

cisco (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refsec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcMrefcve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification