CVE-2019-12663: Cisco IOS XE

High severity, CVSS 8.6. EPSS: 1.8% chance of exploitation in the next 30 days.

A vulnerability in the Cisco TrustSec (CTS) Protected Access Credential (PAC) provisioning module of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of attributes in RADIUS messages. An attacker could exploit this vulnerability by sending a malicious RADIUS message to an affected device while the device is in a specific state.

Affected products

• Cisco IOS XE: version 16.6.4 only; version 16.12.1 only

Published 2019-09-25. Last modified 2026-06-17.