CVE-2025-11739: Unsafe Deserialization RCE Vulnerability

CVE-2025-11739 Overview

CVE-2025-11739 is an insecure deserialization vulnerability (CWE-502) that could allow arbitrary code execution with administrative privileges. The vulnerability is triggered when a locally authenticated attacker sends a crafted data stream that exploits unsafe deserialization practices within affected Schneider Electric products.

Critical Impact

This vulnerability enables locally authenticated attackers to achieve arbitrary code execution with administrative privileges, potentially leading to complete system compromise.

Affected Products

• Schneider Electric products (refer to Schneider Electric Security Notice for specific product details)

Discovery Timeline

• 2026-03-10 - CVE-2025-11739 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2025-11739

Vulnerability Analysis

This vulnerability stems from the unsafe handling of serialized data within affected Schneider Electric software. Deserialization vulnerabilities occur when an application processes untrusted serialized data without proper validation, allowing attackers to inject malicious objects that execute arbitrary code during the deserialization process.

The local attack vector means an attacker must have some level of authenticated access to the target system to exploit this vulnerability. Once exploited, the attacker can achieve code execution with administrative privileges, enabling complete control over the affected system. This type of vulnerability is particularly dangerous in industrial control system (ICS) environments where Schneider Electric products are commonly deployed.

Root Cause

The root cause of CVE-2025-11739 is improper validation of serialized data streams before deserialization. When the application receives and processes a crafted data stream, it fails to verify the integrity and safety of the serialized objects, allowing malicious payload execution. This is classified as CWE-502: Deserialization of Untrusted Data.

Attack Vector

The attack requires local access with authenticated privileges. An attacker would need to:

1. Gain authenticated access to the target system
2. Craft a malicious serialized data stream containing embedded code or object references
3. Send the crafted payload to the vulnerable deserialization endpoint
4. The application deserializes the untrusted data, triggering execution of the attacker's code with administrative privileges

The vulnerability allows the attacker to bypass normal access controls and elevate privileges by exploiting the trust placed in serialized data. For detailed technical information, refer to the Schneider Electric Security Notice.

Detection Methods for CVE-2025-11739

Indicators of Compromise

• Unexpected process spawning with administrative privileges from Schneider Electric application processes
• Anomalous serialized data traffic patterns to/from affected application components
• Unusual system modifications or file changes following application usage
• Evidence of crafted data streams in application logs or network captures

Detection Strategies

• Monitor for unusual process creation events originating from Schneider Electric software components
• Implement application-level logging to capture deserialization events and flag anomalous payloads
• Deploy endpoint detection and response (EDR) solutions to identify code execution attempts following deserialization
• Configure SentinelOne Singularity to detect behavioral indicators associated with deserialization attacks

Monitoring Recommendations

• Enable comprehensive logging on systems running affected Schneider Electric products
• Monitor for privilege escalation attempts following authenticated local sessions
• Implement network segmentation to limit lateral movement in case of successful exploitation
• Regularly review security logs for signs of reconnaissance or exploitation attempts

How to Mitigate CVE-2025-11739

Immediate Actions Required

• Review the Schneider Electric Security Notice for specific patch and mitigation guidance
• Restrict local access to systems running affected software to authorized personnel only
• Implement the principle of least privilege for all user accounts
• Deploy SentinelOne Singularity for real-time protection against exploitation attempts

Patch Information

Schneider Electric has published a security notice addressing this vulnerability. Organizations should consult the official security advisory (SEVD-2026-069-06) for detailed patching instructions and updated software versions.

Workarounds

• Limit network connectivity to affected systems and enforce strict access control policies
• Implement application whitelisting to prevent unauthorized code execution
• Monitor and audit all authenticated local access to affected systems
• Consider isolating affected systems in segmented network zones until patches can be applied

# Example: Restrict access to affected application directories
chmod 750 /opt/schneider-electric/[application]/
chown root:authorized_users /opt/schneider-electric/[application]/