CVE-2025-15320: Tanium Client DOS Vulnerability

CVE-2025-15320 Overview

CVE-2025-15320 is a denial of service vulnerability affecting Tanium Client. This vulnerability allows a local attacker with low privileges to cause service disruption, potentially impacting endpoint management and visibility capabilities within environments relying on Tanium for security operations.

Critical Impact

Local attackers can exploit this vulnerability to disrupt Tanium Client services, potentially affecting endpoint visibility and management operations across enterprise environments.

Affected Products

• Tanium Client (specific versions not disclosed in advisory)

Discovery Timeline

• 2026-02-06 - CVE CVE-2025-15320 published to NVD
• 2026-02-06 - Last updated in NVD database

Technical Details for CVE-2025-15320

Vulnerability Analysis

This vulnerability is classified under CWE-605 (Multiple Binds to the Same Port), indicating that the Tanium Client improperly handles port binding operations. When multiple processes or services attempt to bind to the same network port, it can create resource contention that leads to service unavailability.

The local attack vector requires an attacker to have existing access to the target system with low-level privileges. No user interaction is required to exploit this vulnerability. The impact is limited to availability—there is no confidentiality or integrity impact associated with this flaw.

Root Cause

The root cause stems from improper handling of port binding operations within the Tanium Client. CWE-605 vulnerabilities occur when an application allows multiple binds to the same port, which can be exploited to create a denial of service condition. This typically results from insufficient validation of port availability or improper socket configuration that permits port reuse in unsafe ways.

Attack Vector

The attack requires local access to the system where Tanium Client is installed. An attacker with low-privilege access can exploit the multiple port binding weakness to disrupt the Tanium Client service. This could involve:

1. Creating competing socket bindings on ports used by the Tanium Client
2. Triggering resource exhaustion through repeated binding attempts
3. Causing the legitimate Tanium Client service to fail or become unresponsive

Since this is a local attack requiring existing system access, the exploitation scope is limited compared to network-exploitable vulnerabilities. The Tanium Security Advisory TAN-2025-023 provides additional technical details on the vulnerability mechanism.

Detection Methods for CVE-2025-15320

Indicators of Compromise

• Unexpected Tanium Client service crashes or restarts
• Multiple processes attempting to bind to Tanium Client's communication ports
• Anomalous local user activity on systems with Tanium Client installed
• Service availability gaps in Tanium console for affected endpoints

Detection Strategies

• Monitor for Tanium Client service failures or unexpected restarts on endpoints
• Implement process monitoring to detect unauthorized applications binding to known Tanium ports
• Configure alerting for repeated service disruptions on managed endpoints
• Review system logs for socket binding errors related to Tanium Client

Monitoring Recommendations

• Enable enhanced logging for Tanium Client service status events
• Deploy endpoint detection capabilities to identify suspicious local process activity
• Establish baseline metrics for Tanium Client uptime and monitor for anomalies
• Correlate service disruption events with user activity logs for investigation

How to Mitigate CVE-2025-15320

Immediate Actions Required

• Review the Tanium Security Advisory TAN-2025-023 for specific remediation guidance
• Identify all systems running vulnerable versions of Tanium Client
• Prioritize patching based on endpoint criticality and exposure
• Monitor affected systems for signs of exploitation until patches are applied

Patch Information

Tanium has addressed this vulnerability. Organizations should consult the Tanium Security Advisory TAN-2025-023 for specific patch information and updated Tanium Client versions. Contact Tanium support for access to security updates through official channels.

Workarounds

• Restrict local user access on systems running Tanium Client where possible
• Implement application whitelisting to prevent unauthorized processes from running
• Enhance monitoring on critical endpoints until patches can be deployed
• Consider network segmentation to limit lateral movement if exploitation occurs

Note: Consult the official Tanium security advisory for vendor-recommended workarounds specific to your deployment configuration.