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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.

Cisco ISE 的基于 Web 的管理界面存在一个漏洞，可能允许已认证的远程攻击者在受影响设备的底层操作系统上执行任意命令。要利用此漏洞，攻击者必须至少拥有低权限的管理员凭证。 该漏洞源于对用户提供的 Java 字节流的不安全反序列化。攻击者可以通过向受影响设备的基于 Web 的管理界面发送一个特制的序列化 Java 对象来利用此漏洞。成功利用此漏洞后，攻击者可以在设备上执行任意代码，并将权限提升至 root。在单节点部署中，成功利用此漏洞可能导致受影响的 ISE 节点不可用，从而造成拒绝服务（DoS）状况。在

CVSS 9.9 · Critical EPSS 0.98% · P62

Affected Version Matrix 47

VendorProduct Version RangeStatus
Cisco Cisco Identity Services Engine Software 3.1.0 affected
3.1.0 p1 affected
3.1.0 p3 affected
3.1.0 p2 affected
3.2.0 affected
3.1.0 p4 affected
3.1.0 p5 affected
3.2.0 p1 affected
… +39 more rows
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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 · 79 CVEs total

CVE-2026-76460 10.0 CRITICAL Cisco Identity Services Engine Authentication Bypass Vulnerability
CVE-2026-76423 10.0 CRITICAL Cisco ISE API Authentication Bypass Vulnerability
CVE-2026-20130 10.0 CRITICAL Cisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities
CVE-2026-20192 10.0 CRITICAL Cisco Identity Services Engine Hardening Release - Access Control Vulnerabilities
CVE-2026-20322 9.9 CRITICAL Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Improper Access
CVE-2026-20234 9.9 CRITICAL Cisco Identity Services Engine Hardening Release - Insuffiencently Protected Credential Vu
CVE-2026-20324 9.9 CRITICAL Cisco Secure Firewall Management Center sftunnel Root Arbitrary Code Exectution Vulnerabil
CVE-2026-20329 9.9 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20330 9.9 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20325 9.9 CRITICAL Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Improper Neutra
CVE-2026-20332 9.9 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20326 9.8 CRITICAL Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Missing Authent
CVE-2026-20242 9.8 CRITICAL Cisco Secure Firewall Management Center Software Java Deserialization Remote Code Executio
CVE-2026-20331 9.6 CRITICAL Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20306 9.1 CRITICAL Cisco Identity Services Engine Command Injection Vulnerability
CVE-2026-20305 9.1 CRITICAL Cisco Identity Services Engine Command Injection Vulnerability
CVE-2026-20284 9.1 CRITICAL Cisco Identity Search Engine SXP REST API SQL Injection Vulnerability
CVE-2026-20176 9.1 CRITICAL Cisco Identity Services Engine Remote Code Execution Vulnerability
CVE-2026-20341 9.1 CRITICAL Cisco Secure Firewall Management Center Software sftunnel Deserialization Root Command Exe
CVE-2026-20211 9.1 CRITICAL Cisco Identity Services Engine Remote Code Execution Vulnerability

Showing top 20 of 79 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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