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CVE-2026-20305: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Cisco Cisco Identity Services Engine Software

0
Critical
VulnerabilityCVE-2026-20305cvecve-2026-20305
Published: 09/16/2026 (09/16/2026, 16:55:18 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Identity Services Engine Software

Description

A vulnerability in the diagnostic tools of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands 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 v3.1

Score 9.1critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected software

Cisco

Cisco Identity Services Engine Software

Affected versions
=3.1.0=3.2.0=3.3.0=3.4.0=3.5.0

Cisco

Cisco ISE Passive Identity Connector

Affected versions
=3.2.0=3.1.0=3.3.0=3.4.0
GitHub Actionsmore threats →ai
cisco/identity-services-engine
pkg:github/cisco/identity-services-engine
Affected versions
=3.1.0=3.2.0=3.3.0=3.4.0=3.5.0

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/16/2026, 17:17:07 UTC

Technical Analysis

This vulnerability exists due to improper validation of user-supplied input in the diagnostic tools of Cisco ISE and ISE-PIC. An attacker with valid administrative credentials can send crafted commands via the web-based management interface to perform OS command injection, leading to arbitrary code execution and root privilege escalation. In single-node deployments, exploitation may cause the ISE node to become unavailable, resulting in a denial of service that prevents unauthenticated endpoints from accessing the network.

Potential Impact

Successful exploitation allows arbitrary code execution on the device with root privileges, compromising the confidentiality, integrity, and availability of the system. In single-node deployments, it can cause denial of service, blocking network access for endpoints that have not authenticated.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.408Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6aaacb9c55bf5e2cf5e5c27b

Added to database: 09/16/2026, 17:02:20 UTC

Last enriched: 09/16/2026, 17:17:07 UTC

Last updated: 09/17/2026, 01:41:36 UTC

Views: 13

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