CVE-2026-20311
Cisco IOS XE Software Web UI Denial of Service Vulnerability
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.
Weakness: CWE-126
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco IOS XE Software | Routing & Switching | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco IOS XE Software
Vendor advisory
cisco-sa-xe-webui-dos-PtAODAWW
Cisco IOS XE Software Web-Based Management Interface Denial of Service Vulnerability
Cisco’s rating: Medium (advisory CVSS 6.3) · Published Aug 5, 2026
Bug ID: CSCwu25287
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from