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CVE-2026-20307— Cisco Identity Services Engine Remote Code Execution Vulnerability

Quick assessment

Affected
Cisco Cisco Identity Services Engine Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 le

CVSS 9.9 · Critical
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I. Basic Information for CVE-2026-20307

Vulnerability Information

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Vulnerability Title
Cisco Identity Services Engine Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Identity Services Engine Software 3.1.0 -

II. Public POCs for CVE-2026-20307

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III. Intelligence Information for CVE-2026-20307

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Vendor Advisories for CVE-2026-20307 (1)

Same Patch Batch · Cisco · 2026-09-16 · 6 CVEs total

CVE-2026-20234 9.9 CRITICAL Cisco Identity Services Engine Hardening Release - Insuffiencently Protected Credential Vu
CVE-2026-20331 9.6 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20305 9.1 CRITICAL Cisco Identity Services Engine Command Injection Vulnerability
CVE-2026-20306 9.1 CRITICAL Cisco Identity Services Engine Command Injection Vulnerability
CVE-2026-76420 9.0 CRITICAL Cisco Secure Firewall Management Center Software Impersonated sftunnel Connection Vulnerab

IV. Related Vulnerabilities

Same product: Cisco Identity Services Engine Software
Same vendor: Cisco
Same weakness: CWE-502

V. Comments for CVE-2026-20307

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