OCTOBER 7, 2026
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Case File

CVE-2026-20307

CRITICAL · CVSS 9.9 EPSS 0.95% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-16 · Last synced 2026-10-07

CyberRota Analysis

AI-Generated

A vulnerability in the web-based management interface of Cisco ISE allows authenticated remote attackers with low-privileged administrative credentials to execute arbitrary commands on the underlying operating system by exploiting insecure deserialization of a user-supplied Java byte stream. Successful exploitation could lead to arbitrary code execution, privilege escalation to root, and potential denial of service, rendering the affected ISE node unavailable for unauthenticated endpoints. Organizations using Cisco ISE, particularly those with single-node deployments, should prioritize addressing this critical vulnerability to safeguard their network access and device integrity.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-20307
Severity
CRITICAL
CVSS
9.9
EPSS
0.95%
Cisco Java

Original NVD Description

A vulnerability in the web-based management interface of 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 at least low-privileged administrative credentials. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and 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 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.