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Cisco Security Advisoriescisco-sa-xe-webui-dos-PtAODAWW

Cisco IOS XE Software Web-Based Management Interface Denial of Service Vulnerability

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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-PtAODAWW Security Impact Rating: Medium CVE: CVE-2026-20311

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MediumCVSS not listedMedium severity
Scope

What the vendor says is affected

The collected bulletin did not provide a separate affected-products list. Check the original bulletin before making an exposure decision.

Next step

What the vendor recommends

Cisco has released software updates that address this vulnerability.

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Timeline

When this advisory changed

  1. Published by Cisco

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  2. Added to SecurityAlert

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  3. Confirmed at the source

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Vulnerabilities

CVEs named in this advisory

CVE-2026-20311View CVSS, KEV, EPSS, and threat context
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