Vulnerability in Cisco iOS Xr Software
CVE-2026-20278
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-2026-20278 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) CWE-707.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Cisco Ios Xr Software — versions 24.1.1, 24.1.2, 24.2.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20278?
- CVE-2026-20278 is a high-severity vulnerability in Cisco iOS Xr Software, classified under CWE-707. CVSS score: 8.8/10. Published 2026-09-02.
- How severe is CVE-2026-20278?
- High severity. CVSS v3 base score is 8.8 out of 10.