CVE-2026-20147
Cisco Identity Services Engine Remote Code Execution Vulnerability
Description
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.
Weakness: CWE-77
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco ISE Passive Identity Connector | Identity / IAM / MFA | cna-assigner |
| Cisco | Cisco Identity Services Engine (ISE) Check your version | Identity / IAM / MFA | cna-assigner |
Vendor-reported products (2)
- Cisco · Cisco Identity Services Engine Software
- Cisco · Cisco ISE Passive Identity Connector
Vendor advisory
cisco-sa-ise-rce-traversal-8bYndVrZ
Cisco Identity Services Engine Remote Code Execution and Path Traversal Vulnerabilities
Cisco’s rating: Critical (advisory CVSS 9.9) · Published Apr 15, 2026 · updated Apr 28, 2026 (revision 1.1)
Bug IDs: CSCws52717 , CSCws52738
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from