What’s Vulnerable › Vulnerabilities

CVE-2026-20280: Cisco IOS XR Software Security Hardening Release: September 2026

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-18
• Weakness: CWE-703

Description

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-2026-20280 are related to improper checking or handling of exceptional condition issues that are grouped under the Common Weakness Enumeration (CWE) CWE-703.

Affected products

• Cisco IOS XR Software: 6.5.25, 6.5.26, 6.5.28, 6.5.29, 6.5.31, 6.5.32 (+105)

In the news

• Cisco IOS XR Software Security Hardening Release: September 2026

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM
• https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Get alerted when CVE-2026-20280 or the next vulnerability affects your stack