CVE-2026-20305: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Cisco Cisco Identity Services Engine Software
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.
AI Analysis
Technical Summary
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.
CVE-2026-20305: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Cisco 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
Affected software
Cisco
Cisco Identity Services Engine Software
Cisco
Cisco ISE Passive Identity Connector
pkg:github/cisco/identity-services-engineRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
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.
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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