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CVE-2026-20307

Cisco Identity Services Engine Remote Code Execution Vulnerability

CVSS 3.1 9.9 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-20307

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-20307

Published

Cisco Identity Services Engine Software

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Cisco",
                    "product": "Cisco Identity Services Engine Software",
                    "versions": [
                        {
                            "version": "3.1.0",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p1",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p3",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p2",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p4",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p5",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0 p1",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p6",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0 p2",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p7",
                            "status": "affected"
                        },
                        {
                            "version": "3.3.0",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0 p3",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0 p4",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p8",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0 p5",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0 p6",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p9",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 2",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 1",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 3",
                            "status": "affected"
                        },
                        {
                            "version": "3.4.0",
                            "status": "affected"
                        },
                        {
                            "version": "3.2.0 p7",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 4",
                            "status": "affected"
                        },
                        {
                            "version": "3.4 Patch 1",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p10",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 5",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 6",
                            "status": "affected"
                        },
                        {
                            "version": "3.4 Patch 2",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 7",
                            "status": "affected"
                        },
                        {
                            "version": "3.4 Patch 3",
                            "status": "affected"
                        },
                        {
                            "version": "3.5.0",
                            "status": "affected"
                        },
                        {
                            "version": "3.4 Patch 4",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 8",
                            "status": "affected"
                        },
                        {
                            "version": "3.2 Patch 8",
                            "status": "affected"
                        },
                        {
                            "version": "3.5 Patch 1",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 9",
                            "status": "affected"
                        },
                        {
                            "version": "3.2 Patch 9",
                            "status": "affected"
                        },
                        {
                            "version": "3.4 Patch 5",
                            "status": "affected"
                        },
                        {
                            "version": "3.5 Patch 3",
                            "status": "affected"
                        },
                        {
                            "version": "3.5 Patch 2",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 10",
                            "status": "affected"
                        },
                        {
                            "version": "3.3 Patch 11",
                            "status": "affected"
                        },
                        {
                            "version": "3.4 Patch 6",
                            "status": "affected"
                        },
                        {
                            "version": "3.2 Patch 10",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p72",
                            "status": "affected"
                        },
                        {
                            "version": "3.1.0 p11",
                            "status": "affected"
                        }
                    ],
                    "defaultStatus": "unknown"
                }

Original source record · Cite this exact observation · Complete original publisher JSON