CVE-2026-20272

Critical9.8Published on August 5, 2026

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 software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20272 are related to issues with improper neutralization of special elements that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-74.

CVSS score9.8 / 10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness type (CWE)CWE-74

Vendorscisco

Affected products

Vendors	Product	Versions
cisco	ios xe	16.6.2

Vulnerabilities

Cisco Fixes Critical Vulnerabilities in SD-WAN, IOS XE, and Secure Firewall

Cisco fixes critical vulnerabilities in SD-WAN, IOS XE, and Secure Firewall, including a CVSS 10.0 flaw. Urgent updates required for affected systems.

Aug 6, 202609:172 min readRead

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Cisco Fixes Critical Vulnerabilities in SD-WAN, IOS XE, and Secure Firewall