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CVE-2025-20286: Critical Vulnerability in Cisco Identity Services Engine

A critical vulnerability in Cisco Identity Services Engine (ISE) could enable unauthenticated remote attackers to access sensitive data across cloud environments. Organizations must prioritize mitigation efforts immediately.

CRITICALCVSS 9.9 · Published June 4, 2025

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A critical vulnerability in Cisco Identity Services Engine (ISE) impacts cloud deployments on Amazon Web Services (AWS), Microsoft Azure, and Oracle Cloud Infrastructure (OCI). This vulnerability allows an unauthenticated, remote attacker to access sensitive data, execute limited administrative operations, modify system configurations, or disrupt services within the affected systems. The severity of this vulnerability is underscored by a CVSS score of 9.9, indicating a critical risk to organizations leveraging Cisco ISE in cloud environments.

The root cause of this vulnerability lies in the improper generation of credentials when deploying Cisco ISE on cloud platforms. This flaw results in shared credentials across multiple deployments, allowing an attacker to extract user credentials from one instance and potentially access others through unsecured ports. The implications of a successful exploit are significant, including unauthorized access to sensitive data and disruption of operational integrity.

Organizations should prioritize patching immediately, especially those operating their Primary Administration node in the cloud. The exploitation status currently indicates no public exploit has been confirmed, but the risk remains high due to the critical nature of the vulnerability.

In light of these findings, the urgency for organizations to address this vulnerability cannot be overstated. Security teams must act swiftly to mitigate the associated risks and ensure compliance with best practices for security management.

Vulnerability Details

The vulnerability in Cisco ISE allows for unauthorized access and manipulation of system configurations. It is classified under CWE-259 for improper generation of credentials. The CVSS 3.1 vector for this vulnerability is AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H, indicating a network attack vector, low attack complexity, no privileges required, and significant impacts on confidentiality, integrity, and availability.

Technical Analysis

The root cause stems from the improper generation of user credentials during the deployment of Cisco ISE on cloud platforms. This misconfiguration allows multiple deployments to share the same credentials, leading to potential unauthorized access. Attackers may exploit this vulnerability via a network attack vector with low complexity, requiring no user interaction or privileges.

This vulnerability impacts the confidentiality and integrity of the systems involved while potentially leading to a significant availability impact, especially if services are disrupted. It highlights the critical need for secure credential management in cloud environments.

Risk & Impact Analysis

Real-world deployment risk includes unauthorized access to sensitive data, which can lead to data breaches and operational disruptions. Organizations leveraging Cisco ISE on cloud platforms face a significant threat, as attackers may gain administrative access to multiple deployments with the same credentials.

The urgency assessment is critical. Organizations should prioritize patching immediately to mitigate the risk of exploitation and protect sensitive data against unauthorized access.

Exploitation Status

Signal

Status

Known Exploit

No

Public PoC

No

Actively Exploited

No

Ransomware Use

No

Affected Versions

The vulnerability affects Cisco Identity Services Engine versions 3.1.0 to 3.4.0, including all patches prior to vendor patch release. Organizations should verify their deployments and apply necessary patches to mitigate this vulnerability.

Mitigation & Remediation

Organizations must patch Cisco Identity Services Engine to the latest version to address this vulnerability. If a patch is not available, consider implementing configuration hardening practices and network controls to limit access to the systems. Continuous monitoring of system logs for anomalous activities is also recommended.

For comprehensive security assessments, organizations should consider engaging in penetration testing services to identify potential vulnerabilities before they can be exploited.

Detection Guidance

Organizations should monitor log indicators for unauthorized access attempts and unusual administrative activities. Behavioral anomalies in user interactions with the Cisco ISE system should be flagged for further investigation, alongside network signatures that may indicate exploitation attempts.

AppSecure Threat Intelligence Insight

This vulnerability signifies a critical security risk for organizations relying on cloud services for Cisco ISE. The trend of cloud deployments sharing the same credentials raises significant concerns about the security of sensitive data and operational integrity.

Organizations are encouraged to implement robust security measures and regularly assess their configurations against best practices. For further insights, organizations can refer to our penetration testing methodology to enhance their security posture.

Additionally, organizations should stay informed about the evolving threat landscape. Engaging in vulnerability management programs can help in proactively addressing such vulnerabilities.

Organizations must also consider the importance of a comprehensive API penetration testing approach as part of their overall security strategy.

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

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