CVE-2026-20276 — HIGH (8.6)

Vulnerability 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-2026-20276 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-691.

CVSS Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Cisco	Ios Xr	6.5.25

Related Weaknesses (CWE)

CWE-691

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ciVendor Advisory
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-LevNot Applicable

FAQ

What is CVE-2026-20276?

CVE-2026-20276 is a vulnerability with a CVSS score of 8.6 (HIGH). 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...

How severe is CVE-2026-20276?

CVE-2026-20276 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-20276?

Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios Xr.