CVE-2025-13913: 
NixOS vulnerability analysis and mitigation

CVE-2025-13913 is a Deserialization of Untrusted Data vulnerability (CWE-502) in Inductive Automation Ignition Software affecting all versions prior to 8.3.0. When a privileged Ignition user imports an external file containing a specially crafted payload, embedded malicious code executes during the deserialization process. The vulnerability was disclosed on March 12, 2026, via CISA ICS Advisory ICSA-26-071-06. It carries a CVSS v3.1 base score of 6.3 (Medium) per the vendor/CISA advisory, though NVD scores it at 6.8 (Medium) (CISA Advisory, CISA CSAF).

The root cause is improper deserialization of untrusted data (CWE-502) during the Ignition project import process. When a privileged user imports a maliciously crafted project or configuration file, the application deserializes the file contents without sufficient validation, allowing embedded code to execute with the permissions of the OS application service account running the Ignition process. Exploitation requires the attacker to be on an adjacent network, hold high privileges within the Ignition application, and induce (or directly perform) the import of a weaponized file — either through social engineering or by directly controlling a privileged account. No public proof-of-concept code has been identified at this time (CISA Advisory, CISA CSAF).

Successful exploitation allows an attacker to execute arbitrary malicious code with the OS-level permissions of the Ignition service account, potentially compromising confidentiality, integrity, and availability of the affected system. In environments where the Ignition service account has broad filesystem or domain privileges, this could enable lateral movement into OT/ICS networks, exfiltration of sensitive operational data, or disruption of industrial control processes. The vulnerability is particularly significant given Ignition's widespread deployment in critical infrastructure sectors globally (CISA Advisory).

No known public exploitation of CVE-2025-13913 has been reported to CISA, and the vulnerability is explicitly noted as not remotely exploitable. The EPSS score is approximately 0.027%, reflecting low near-term exploitation probability. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires adjacent network access, high application privileges, and user interaction (importing a malicious file), significantly limiting the attack surface (CISA Advisory).

1. Gain privileged access: Obtain credentials for a privileged Ignition user account (e.g., one with Designer or Config Write permissions) through phishing, credential theft, or insider access on an adjacent network segment.
2. Craft malicious payload: Create a specially crafted Ignition project or configuration file that embeds a malicious serialized Java object designed to execute arbitrary code upon deserialization.
3. Deliver the file: Deliver the malicious file to the target privileged user via social engineering (e.g., email attachment, shared network drive) or directly use the compromised privileged account to initiate the import.
4. Trigger import: The privileged user (or attacker using their session) imports the malicious file through the Ignition Designer or gateway interface.
5. Code execution: During deserialization of the imported file, the embedded malicious payload executes with the permissions of the Ignition OS service account, enabling reverse shell establishment, data exfiltration, or further lateral movement within the OT/ICS environment (CISA Advisory, CISA CSAF).

• Logs: Ignition gateway logs showing unexpected project import events, particularly from unusual sources or at unusual times; Java deserialization errors or stack traces in Ignition wrapper logs.
• Process: Unexpected child processes spawned by the Ignition Java process (e.g., cmd.exe, powershell.exe, /bin/bash, curl, wget) running under the Ignition service account.
• File System: Unexpected files written to the Ignition installation directory or temp directories by the service account; new scripts, executables, or scheduled tasks created under the Ignition service account context.
• Network: Unusual outbound connections from the Ignition server to external or unexpected internal IP addresses, particularly following a project import event; connections to known C2 infrastructure from the service account process.

The primary remediation is to upgrade Inductive Automation Ignition Software from 8.1.x to version 8.3.0 or later. For systems that cannot be immediately upgraded, CISA and Inductive Automation recommend implementing the Ignition Security Hardening Guide (Appendix A) for both Linux and Windows, which includes running the Ignition service under a dedicated, least-privilege local account with restricted filesystem access. Additional best practices include restricting project imports to verified and trusted sources (using checksums or digital signatures), using multi-environment staging workflows (Dev/Test/Prod) to prevent untrusted data from reaching production, enforcing MFA for all privileged Ignition users, and segmenting Ignition gateways from corporate networks and Windows domains (CISA Advisory, Hardening Guide).

The vulnerability was reported to Inductive Automation by Nik Tsytsarkin, Ismail Aydemir, and Ryan Hall of Meta's security team, and subsequently coordinated with CISA by Nathan Boeger and Joel Specht of Inductive Automation. CISA published ICS Advisory ICSA-26-071-06 on March 12, 2026, noting no known public exploitation at the time of disclosure. No significant broader community or social media reactions have been identified beyond standard vulnerability database aggregation (CISA Advisory, CISA CSAF).