CVE-2026-20311

MEDIUM · CVSS 6.3 · EPSS 0.16% · CWE CWE-126

A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

CVE-2026-20311 is confirmed by Cisco as affecting 3 products, including Cisco IOS XE Software, Cisco IOS XE Catalyst SD-WAN, and Cisco Catalyst SD-WAN Controller, via 1 advisory (CVSS 6.3; EPSS 0.2%).

3 products with CSAF evidence