CVE-2026-20274: Cisco IOS XR Software Security Hardening Release: September 2026
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-2026-20274 are related to improper resource control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-664.
Affected Software
Event History
Frequently Asked Questions
What systems are known to be affected?
The provided information identifies Cisco IOS XR Software Security Hardening Release as the affected software context. It does not identify specific IOS XR versions, platforms, or configurations.
Can this be exploited remotely without authentication?
The supplied severity vector indicates network attack vector, low attack complexity, no privileges required, and no user interaction required. This indicates the issue is assessed as remotely exploitable without authentication or user involvement.
What is the impact if exploitation succeeds?
The severity vector rates confidentiality, integrity, and availability impact as high. The description characterizes the underlying issues as improper resource control problems under CWE-664.
What mitigation is available if patching cannot be completed immediately?
No temporary mitigation, workaround, or compensating control is provided in the available information. The data only states that Cisco issued software hardening releases addressing the internally discovered vulnerabilities.