Threats Tagged 'cve-2026-20211'

CVE-2026-20211 is a critical vulnerability in Cisco Identity Services Engine (ISE) that allows an authenticated attacker with high-privileged administrative credentials to execute arbitrary commands on the underlying operating system. The flaw arises from insecure deserialization of Java objects. Exploitation involves sending a crafted serialized Java object to the affected device, potentially leading to user-level access and privilege escalation to root. In single-node deployments, exploitation can cause a denial-of-service condition by making the node unavailable, disrupting network access for unauthenticated endpoints.

A vulnerability in Cisco ISE 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 high-privileged administrative credentials. This vulnerability is due to insecure deserialization of Java objects by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object 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 deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.