What’s Vulnerable › Vulnerabilities
CVE-2026-20311: Cisco IOS XE Software Web UI Denial of Service Vulnerability
- Severity: medium (CVSS 6.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-05 · updated 2026-10-23
- Weakness: CWE-126
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
- Cisco IOS XE: 17.3.1, 17.3.1a, 17.3.2a, 17.3.1w, 17.3.2, 17.4.1 (+146)
References
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