CVE-2025-11739: Deserialization RCE Vulnerability

CVE-2025-11739 Overview

CVE-2025-11739 is a deserialization of untrusted data vulnerability [CWE-502] disclosed in a Schneider Electric product. A locally authenticated attacker can send a crafted data stream that triggers unsafe deserialization, leading to arbitrary code execution with administrative privileges. The flaw requires local access and low privileges, but successful exploitation results in full compromise of confidentiality, integrity, and availability on the affected host.

The vulnerability was published to the National Vulnerability Database on March 10, 2026 and is documented in Schneider Electric Security Notice SEVD-2026-069-06.

Critical Impact

Successful exploitation grants attackers arbitrary code execution at administrative privilege level, providing complete control over the affected system.

Affected Products

• Schneider Electric product as identified in Security Notice SEVD-2026-069-06
• Specific product versions referenced in the vendor advisory
• See the Schneider Electric Security Notice SEVD-2026-069-06 for the authoritative list of impacted products and versions

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

The vulnerability stems from unsafe deserialization of attacker-controlled input. When the affected component processes a serialized data stream, it reconstructs objects without validating the type or contents of the serialized payload. This allows an attacker to embed gadget chains that execute code during the deserialization process.

Exploitation requires local access and a low-privileged authenticated session. Once an attacker delivers a crafted serialized object to the vulnerable interface, the application instantiates attacker-defined objects and invokes their methods. The resulting code executes in the security context of the receiving process, which runs with administrative privileges.

The outcome is a complete compromise of the host. Attackers can install persistence, modify configuration, tamper with industrial control logic, or pivot to connected systems. In operational technology environments, this can disrupt physical processes managed by the affected component.

Root Cause

The root cause is [CWE-502] Deserialization of Untrusted Data. The vulnerable code path accepts a serialized byte stream from a local interface and reconstructs objects without enforcing a type allowlist, signature verification, or integrity checks. Standard mitigations such as LookAheadObjectInputStream, serialization filters, or cryptographic signing of payloads are absent.

Attack Vector

The attack vector is local. An attacker must already hold authenticated access with low privileges on the host or have access to a local interprocess communication channel exposed by the application. The attacker then submits a crafted serialized payload to the vulnerable endpoint. No user interaction is required, and attack complexity is low. Detailed technical analysis is available in the Schneider Electric Security Notice SEVD-2026-069-06.

No verified public proof-of-concept code is available at the time of publication. Refer to the vendor advisory for technical specifics.

Detection Methods for CVE-2025-11739

Indicators of Compromise

• Unexpected child processes spawned by the affected Schneider Electric service running with administrative privileges
• Anomalous local IPC or named pipe traffic targeting the vulnerable component
• New scheduled tasks, services, or registry persistence created shortly after interaction with the affected application
• Outbound network connections initiated by the affected process to untrusted destinations

Detection Strategies

• Monitor process lineage for the affected service and alert on spawning of interpreters such as cmd.exe, powershell.exe, or scripting hosts
• Inspect local interfaces and IPC endpoints exposed by the application for serialized data patterns consistent with known gadget chains
• Enable application-level logging for deserialization events and correlate failures with subsequent process activity

Monitoring Recommendations

• Forward endpoint telemetry, including process creation, file writes, and network connections, to a centralized logging or SIEM platform for correlation
• Track authentication events on hosts running the affected software to identify local accounts that interact with the vulnerable component
• Baseline normal behavior of the Schneider Electric service and alert on deviations such as unexpected module loads or thread injection

How to Mitigate CVE-2025-11739

Immediate Actions Required

• Apply the vendor-supplied patch referenced in Schneider Electric Security Notice SEVD-2026-069-06 as soon as it is available for your product version
• Restrict local interactive and remote access to hosts running the affected software to administrators and required service accounts only
• Audit local accounts on affected hosts and remove unnecessary low-privileged users that could be leveraged for exploitation
• Segment operational technology networks to limit lateral movement from compromised engineering workstations

Patch Information

Schneider Electric has published remediation guidance in Schneider Electric Security Notice SEVD-2026-069-06. Review the advisory for fixed versions, upgrade procedures, and any vendor-recommended compensating controls.

Workarounds

• Disable or block local interfaces of the affected component if they are not required for operations
• Enforce application allowlisting on hosts running the affected software to prevent execution of unauthorized binaries dropped post-exploitation
• Apply host-based firewall rules to restrict IPC and local socket access to authorized processes only
• Increase monitoring on engineering workstations and other systems hosting the affected product until patches are deployed