CVE-2026-20147
CriticalCVSS 9.9Exploitation Probability (EPSS)
Very high risk95th percentile — higher than 95% of all known CVEs
Summary
A vulnerability in Cisco ISE and Cisco ISE-PIC allows an authenticated remote administrator to execute arbitrary commands on the underlying OS. The issue is due to insufficient input validation.
Risk Assessment
An attacker with admin credentials can gain OS access and escalate to root, potentially causing a denial of service on single-node ISE deployments, blocking network access for unauthenticated endpoints.
Recommendation
Apply the security update provided by Cisco for affected ISE and ISE-PIC versions immediately. Restrict administrative access to trusted IP addresses only.
Original NVD description (English source)
A vulnerability in Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. In single-node ISE deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a denial of service (DoS) condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.