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Medium · 6.3 CVE-2026-20311 EUVD-2026-53475GHSA-7wh7-mfpx-74m2

Cisco IOS XE Software Web UI Denial of Service Vulnerability

Published Aug 5, 2026 · Updated Aug 5, 2026 · Assigned by cisco

Description

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.

Affected products

VendorProductAffectedFixed
Cisco Cisco IOS XE Software 17.3.1, 17.3.1a, 17.3.2a, 17.3.1w, 17.3.2, 17.4.1, 17.4.1a, 17.3.1x, 17.3.3, 17.5.1, 17.4.1b, 17.3.1z, 17.4.2, 17.3.3a, 17.3.5, 17.3.4, 17.5.1a, 17.6.1, 17.3.4a, 17.6.1a, 17.7.1, 17.6.1x, 17.6.2, 17.3.4c, 17.4.2a, 17.3.4b, 17.7.1a, 17.8.1a, 17.6.3a, 17.6.3, 17.7.2, 17.7.1b, 17.9.1w, 17.3.5a, 17.6.1… —

Advisories 1

References