CVE-2026-20311: Cisco IOS XE Software Web UI 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-20311?
CVE-2026-20311 has a medium severity rating of 6.3.
What type of attack does CVE-2026-20311 allow?
CVE-2026-20311 allows an authenticated, remote attacker to execute a denial of service (DoS) attack.
What causes the vulnerability in CVE-2026-20311?
CVE-2026-20311 is caused by insufficient error handling in the web-based management interface of Cisco IOS XE Software.
Who is affected by CVE-2026-20311?
CVE-2026-20311 affects devices running Cisco IOS XE Software that utilize the web-based management interface.
How can I mitigate the risk of CVE-2026-20311?
To mitigate CVE-2026-20311, ensure that only privileged authenticated users have access to the web-based management interface and monitor for abnormal activity.