CVE-2026-20307

9.9 CRITICAL

Published 2026-09-16 · Updated 2026-09-17

AI risk analysis

Summary: This vulnerability allows an attacker to execute arbitrary commands on the underlying operating system of a Cisco ISE device by exploiting insecure deserialization of a Java byte stream, potentially leading to privilege escalation and denial of service.
Exploitability: Exploitation requires low-privileged administrative credentials and sending a crafted serialized Java object to the web-based management interface, making it moderately difficult.
Blast radius: If exploited, this could result in arbitrary code execution and privilege escalation to root, potentially causing a denial of service for the affected ISE node.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the latest version of Cisco ISE as soon as possible.

rcewebjavapriv-escalationdenial-of-service

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-502

All references

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-rce-se7bYU57

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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