Critical Vulnerabilities in HPE ClearPass Policy Manager Expose Enterprise Networks

This Mjolnir Threat Intelligence (MTAC) brief — reference TIB-2026-10-12-VULNERABILIT — assesses the situation below. TLP: CLEAR · Severity CRITICAL · Confidence HIGH · Issued 12 Oct 2026. Multiple critical vulnerabilities in HPE ClearPass Policy Manager could allow remote code execution, privilege escalation, and network compromise. Immediate action is required for all organizations leveraging this platform.

Executive Summary (BLUF)

Critical Insight

Background & Analysis

HPE Networking ClearPass Policy Manager is a leading network access control (NAC) solution, commonly used to enforce authentication, authorization, and accounting (AAA) policies for wired and wireless networks. It integrates with directory services, identity providers, and security platforms to provide granular access control and visibility over network devices and users.

Critical vulnerabilities have been identified in ClearPass Policy Manager, affecting multiple versions and deployment scenarios. These vulnerabilities include remote code execution, privilege escalation, and authentication bypass, often stemming from improper input validation, insecure default configurations, or exposed management interfaces. Successful exploitation could allow attackers to take control of the ClearPass server, modify policies, and pivot to other network assets.

The vulnerabilities were publicly disclosed on 12 Oct 2026 and acknowledged by HPE. Vendor patches and mitigations have been released, but exploitation attempts are expected to increase as technical details and proof-of-concept exploits become available.

Incident Overview

MITRE ATT&CK Mapping

Detection & Hunting

• Monitor ClearPass server logs for failed or anomalous authentication attempts, especially from external or unrecognized IP addresses.
• Review web server and API access logs for unusual HTTP methods, large payloads, or requests to endpoints associated with known vulnerabilities.
• Set up alerts for new administrative accounts or privilege changes within the ClearPass platform.
• Correlate network traffic for unexpected outbound connections from ClearPass servers, which may indicate command-and-control activity.
• Use EDR/XDR solutions to detect suspicious process execution or privilege escalation on ClearPass hosts.
• Implement file integrity monitoring on ClearPass configuration files and binaries to detect unauthorized modifications.
• Hunt for indicators of lateral movement originating from ClearPass servers, such as SMB, RDP, or LDAP traffic to internal assets.
• Monitor for known IOCs and exploit signatures as released by HPE, CERTs, and threat intelligence providers.

Attack Chain

1. Reconnaissance. Threat actors scan for internet-exposed or internally accessible ClearPass Policy Manager instances, identifying version numbers and accessible interfaces.
2. Initial Access. Attackers exploit public-facing vulnerabilities in the ClearPass web interface or APIs, often requiring no authentication or leveraging weak credentials.
3. Execution. Malicious payloads or commands are executed on the ClearPass server, typically via remote code execution flaws.
4. Privilege Escalation. Attackers leverage privilege escalation vulnerabilities to obtain administrative access within the ClearPass environment.
5. Persistence. Backdoors or rogue accounts are created to maintain access, and configuration changes may be made to evade detection.
6. Credential Access. Stored credentials and tokens are extracted from the compromised ClearPass server, enabling further compromise of network resources.
7. Lateral Movement. Compromised ClearPass access is used to pivot to other network segments, exploiting trust relationships and policy misconfigurations.
8. Impact. Attackers modify or disable network access policies, exfiltrate sensitive data, or disrupt critical business operations.

Threat Actor & Geopolitical Context

Attribution is currently unknown, but the vulnerabilities are likely to attract both opportunistic cybercriminals and advanced persistent threat (APT) actors, given the criticality and wide deployment of ClearPass. Historically, similar NAC vulnerabilities have been exploited by ransomware groups and state-sponsored actors for initial access and lateral movement.

The technical nature of the vulnerabilities suggests that exploitation could be automated, increasing the risk of mass scanning and widespread attacks. Organizations with internet-exposed ClearPass instances or weak internal segmentation are at highest risk. Organizations should anticipate rapid weaponization and incorporate these vulnerabilities into their threat modeling, incident response, and red teaming exercises.

Hardening Recommendations

1. Apply HPE Patches Immediately IMMEDIATE
   Download and install the latest security patches for ClearPass Policy Manager as released by HPE on 12 Oct 2026. Prioritize internet-exposed and mission-critical instances. Validate successful patching through system logs and version checks.
2. Restrict Access to Management Interfaces IMMEDIATE
   Ensure that ClearPass management interfaces (web, SSH, API) are not exposed to the internet and are accessible only from trusted, segmented networks. Implement network ACLs and VPN access where possible.
3. Enhance Monitoring and Logging HIGH
   Enable detailed logging on ClearPass servers and aggregate logs to a central SIEM. Set up alerts for anomalous access, configuration changes, and failed authentication attempts.
4. Conduct Compromise Assessment HIGH
   Perform a thorough review of ClearPass servers for indicators of compromise, including unauthorized accounts, configuration changes, and suspicious processes. Leverage forensic tools where necessary.
5. Implement Multi-Factor Authentication HIGH
   Enforce multi-factor authentication (MFA) for all administrative access to ClearPass Policy Manager to reduce the risk of credential-based attacks.
6. Review and Harden NAC Policies MEDIUM
   Audit and tighten ClearPass access policies and ensure that least privilege principles are enforced. Remove unused accounts and disable legacy protocols.
7. Validate Network Segmentation MEDIUM
   Ensure that ClearPass servers are isolated from critical business systems and that lateral movement is restricted through network segmentation and firewall rules.
8. Update Incident Response Playbooks MEDIUM
   Incorporate ClearPass exploitation scenarios into your incident response plans and conduct tabletop exercises to validate readiness.
9. Engage with Vendor and Threat Intelligence Feeds LOW
   Subscribe to HPE and relevant CERT advisories for updates, and monitor threat intelligence feeds for emerging IOCs and exploit details.

Supplementary Controls

Network Security

• Implement strict firewall rules to limit access to ClearPass management ports.
• Deploy network IDS/IPS with signatures for known ClearPass exploits.
• Use network segmentation to isolate NAC infrastructure from core business assets.

Identity & Access Management

• Enforce strong, unique passwords for all ClearPass accounts.
• Regularly review and audit administrative and service accounts.
• Enable multi-factor authentication for all privileged access.

Vulnerability Management

• Include ClearPass Policy Manager in routine vulnerability scans.
• Track patch deployment status and remediate any gaps promptly.
• Validate that compensating controls are in place for unpatched systems.

Incident Response

• Develop and rehearse response plans for NAC compromise scenarios.
• Ensure rapid access to forensic tools and expertise for ClearPass investigations.
• Maintain up-to-date contact information for HPE support and relevant CERTs.

Prioritized Action Plan

References

1. Critical Vulnerabilities in HPE Networking ClearPass Policy Manager (RedPacketSecurity) — https://www.redpacketsecurity.com/csa-gov-sg-critical-vulnerabilities-in-hpe-networking-clearpass-policy-manager-12-10-2026/
2. CISA Guidance on Network Access Control Security — https://www.cisa.gov/resources-tools/resources/network-access-control-nac
3. NIST SP 800-53: Access Control — https://csrc.nist.gov/publications/detail/sp/800-53/rev-5/final
4. CERT/CC Vulnerability Notes Database — https://www.kb.cert.org/vuls/
5. HPE ClearPass Product Documentation — https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c05230593
6. MITRE ATT&CK Techniques — https://attack.mitre.org/