CVE-2026-20273

HighCVSS 8.6/10Last modified Oct 23, 2026

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

Metrics

CVSS 3.1 8.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
Cisco	Cisco IOS XE Software	17.2.1a; 16.12.1y; 16.12.3s; 16.7.1b; 16.6.2; 16.6.5; 16.12.1w; 16.9.1d; 17.3.1; 16.9.4c; 16.7.1; 17.2.1; 16.6.8; 16.9.1b; 16.9.2s; 16.12.4; 16.12.3a; 17.1.1s; 16.11.1a; 16.7.2

References

Timeline

Published: Aug 5, 2026
Last modified: Oct 23, 2026
NVD status: Analyzed

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