CVE-2026-20276: Cisco IOS XR Software Security Hardening Release: September 2026
Published Sep 2, 2026
·Updated
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-2026-20276 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-691.
Affected Software
1 affected component
Cisco IOS XR Software Security Hardening Release
Event History
Sep 2, 2026
CVE Published
via MITRE·04:13 PM
Data Sourced
via MITRE·04:13 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What access does an attacker need to exploit this issue?
The vector is network-based with low attack complexity. The score indicates no privileges or user interaction are required.
2
What is the expected impact if exploitation succeeds?
The reported impact is high availability impact, with no reported confidentiality or integrity impact. The CVSS vector also indicates scope change.