CVE-2025-14026: Forcepoint One DLP Client RCE Vulnerability

CVE-2025-14026 Overview

CVE-2025-14026 is a security restriction bypass vulnerability affecting Forcepoint One DLP Client. The vulnerability exists in the embedded Python 2.5.4 interpreter, which includes restrictions designed to prevent the use of the ctypes library. The ctypes module is a foreign function interface (FFI) for Python that enables calls to DLLs and shared libraries, memory allocation, and direct code execution. Researchers demonstrated that these security restrictions could be bypassed, potentially allowing attackers to execute arbitrary code through the DLP client.

Critical Impact

Attackers with local access can bypass Python security restrictions to leverage the ctypes library for DLL calls, memory manipulation, and direct code execution, potentially compromising endpoint security controls.

Affected Products

• Forcepoint One DLP Client version 23.04.5642
• Forcepoint One DLP Client (possibly newer versions)

Discovery Timeline

• 2026-01-06 - CVE CVE-2025-14026 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-14026

Vulnerability Analysis

This vulnerability represents a security restriction bypass in the Forcepoint One DLP Client's embedded Python interpreter. Forcepoint implemented a restricted version of Python 2.5.4 within their DLP client, specifically attempting to block access to the ctypes library to prevent potentially dangerous operations. The ctypes module provides C-compatible data types and allows calling functions in DLLs or shared libraries directly from Python code, which could be leveraged for malicious purposes if accessible.

The core issue is that the restrictions imposed on the Python interpreter are insufficient and can be circumvented. This enables an attacker with local access to regain functionality that was intentionally disabled, effectively negating the security controls the vendor put in place.

Root Cause

The root cause of this vulnerability lies in the incomplete implementation of Python interpreter restrictions within the Forcepoint One DLP Client. While the vendor attempted to disable access to the ctypes module, the restriction mechanism does not comprehensively prevent all methods of accessing foreign function interface capabilities. Python's dynamic nature and multiple code paths to achieve similar functionality create opportunities to bypass single-point restrictions.

The use of Python 2.5.4, an outdated and end-of-life Python version, compounds the issue as it lacks modern security hardening features and may contain additional unaddressed vulnerabilities.

Attack Vector

The attack requires local access to a system running the vulnerable Forcepoint One DLP Client. An attacker with low-privilege access can exploit this vulnerability through the following general approach:

1. Identify the restricted Python environment within the DLP client
2. Utilize alternative Python import mechanisms or module access patterns to bypass the ctypes restriction
3. Once ctypes access is obtained, leverage it to call arbitrary DLL functions, allocate memory, or execute code directly

This local attack vector requires no user interaction and can be exploited with low attack complexity once an attacker has established local access to the target system.

The vulnerability allows attackers to bypass intended security restrictions by circumventing the Python interpreter controls. For detailed technical information on the bypass methodology, refer to the CERT Vulnerability Advisory #420440 and the ForcePoint Support Article.

Detection Methods for CVE-2025-14026

Indicators of Compromise

• Unusual Python process activity originating from the Forcepoint DLP Client installation directory
• Attempts to load or access ctypes module or related FFI libraries within DLP client processes
• Unexpected DLL loading events from Python interpreter processes associated with the DLP client
• Memory allocation patterns inconsistent with normal DLP client behavior

Detection Strategies

• Monitor for process execution anomalies where the Forcepoint DLP Client Python interpreter attempts to load restricted modules
• Implement application whitelisting to detect unauthorized code execution through the DLP client
• Deploy endpoint detection rules to identify suspicious DLL injection or memory manipulation attempts from the DLP client directory
• Review Windows Event Logs for unusual module loading events associated with DLP client processes

Monitoring Recommendations

• Enable enhanced logging for the Forcepoint One DLP Client and monitor for Python-related error messages indicating bypass attempts
• Configure SentinelOne's behavioral AI to alert on unusual interpreter activity from DLP client installations
• Implement file integrity monitoring on the DLP client installation directory to detect unauthorized modifications
• Review system calls and API usage patterns from DLP client processes for anomalous behavior

How to Mitigate CVE-2025-14026

Immediate Actions Required

• Review the ForcePoint Support Article for vendor-provided mitigation guidance
• Assess exposure by identifying all systems running Forcepoint One DLP Client version 23.04.5642 or newer
• Implement additional endpoint monitoring on affected systems until patches are applied
• Restrict local access to systems with the vulnerable DLP client to minimize attack surface

Patch Information

Organizations should consult the official ForcePoint Support Article for the latest patch information and remediation guidance. Contact Forcepoint support directly to confirm the availability of a patched version that addresses this security restriction bypass vulnerability.

Additional technical details are available in the CERT Vulnerability Advisory #420440.

Workarounds

• Limit local user access to systems running the affected DLP client through principle of least privilege
• Implement application control policies to restrict execution of unauthorized code within the DLP client context
• Consider network segmentation to isolate systems with the vulnerable client until remediation is complete
• Monitor Python interpreter processes from the DLP client for suspicious behavior as an interim detection measure

# Example: Query for Forcepoint DLP Client version on Windows systems
wmic product where "name like '%Forcepoint%DLP%'" get name, version

# Example: Monitor for suspicious DLL loading events (Windows PowerShell)
Get-WinEvent -FilterHashtable @{LogName='Security';Id=7045} | Where-Object {$_.Message -like "*forcepoint*"}