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EPSS 0.3%top 45%

CVE-2026-20147: Improper Neutralization of Special Elements used in a Command ('Command Injection') in Cisco Cisco Identity Services Engine Software

0
Critical
VulnerabilityCVE-2026-20147cvecve-2026-20147
Published: Wed Apr 15 2026 (04/15/2026, 16:03:25 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Identity Services Engine Software

Description

CVE-2026-20147 is a critical command injection vulnerability in Cisco Identity Services Engine (ISE) software. It allows an authenticated attacker with administrative credentials to execute arbitrary commands on the underlying operating system by sending crafted HTTP requests. Successful exploitation can lead to user-level access and privilege escalation to root. In single-node deployments, exploitation may cause denial of service by making the ISE node unavailable, disrupting network access for unauthenticated endpoints.

CVSS v3.1

Score 9.9critical

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

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 04/22/2026, 23:16:36 UTC

Technical Analysis

This vulnerability in Cisco ISE and Cisco ISE-PIC arises from insufficient validation of user-supplied input, enabling command injection via crafted HTTP requests. An attacker must have valid administrative credentials to exploit this flaw. Exploitation can result in arbitrary command execution on the OS, privilege escalation to root, and potential denial of service in single-node ISE deployments due to node unavailability.

Potential Impact

An attacker with administrative credentials can execute arbitrary commands on the affected device's operating system, potentially gaining root privileges. This can compromise confidentiality, integrity, and availability of the system. In single-node ISE deployments, exploitation can cause denial of service, preventing network access for unauthenticated endpoints until the node is restored.

Mitigation Recommendations

Patch status is not yet confirmed — check the Cisco vendor advisory for current remediation guidance. Until an official fix is available, restrict administrative access to trusted personnel only and monitor for suspicious activity. Consider deploying multi-node ISE clusters to mitigate availability impact in case of exploitation.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.385Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 69dfb9f682d89c981f6ee687

Added to database: 4/15/2026, 4:16:54 PM

Last enriched: 4/22/2026, 11:16:36 PM

Last updated: 5/30/2026, 6:24:52 PM

Views: 92

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