CVE-2025-24016: Wazuh Server Deserialization of Untrusted Data Vulnerability

CVE-2025-24016 is a deserialization of untrusted data vulnerability in the Wazuh Server component. According to CISA, it allows remote code execution on affected Wazuh servers. Because Wazuh servers often sit at the center of security monitoring and log collection, successful exploitation can give an attacker control of a high-privilege host that already has broad visibility into the rest of the environment. Specifics such as exact affected versions and attack vectors must be confirmed against the vendor advisory.

IT and security teams should treat this as a priority for inventory and remediation. Deserialization flaws of this class (CWE-502) are frequently remote and can lead to full system compromise without requiring prior authentication, depending on how the service is exposed.

How it works

The underlying weakness is CWE-502: Deserialization of Untrusted Data. In this class of flaw, an application accepts serialized objects or data streams from an untrusted source and reconstructs them into live objects without sufficient validation. If the deserialization process can be influenced by an attacker, it may instantiate unexpected classes, invoke dangerous methods, or execute arbitrary code in the context of the Wazuh server process.

An attacker who can reach the vulnerable deserialization endpoint or data path on a Wazuh server can supply a crafted payload that, when processed, results in remote code execution. Public detail on the precise protocol, message format, or required access level is limited; defenders should assume network-reachable Wazuh server interfaces that accept structured data are in scope until the vendor advisory states otherwise. No exploit code or step-by-step mechanics are provided here; always verify the current technical description against the official advisory.

Am I affected? How to find it in your systems

Wazuh Server is the central management and analysis component of the Wazuh platform. It is commonly deployed on Linux hosts (on-premises or cloud) that receive agent data, perform rule evaluation, and store or forward security events. Look for hosts running the Wazuh manager or server packages, listening on the ports documented by the vendor for manager-agent or API communication, or identified in configuration management as “wazuh-manager” / “wazuh-server.”

• Inventory: Query package managers, configuration-management databases, container images, and cloud asset inventories for Wazuh server installations. Check version strings against the list of fixed releases published in the vendor advisory.
• Configuration review: Note whether the server is reachable from untrusted networks, whether authentication is enforced on management interfaces, and whether any custom integrations feed data into deserialization paths.
• Telemetry: Review authentication logs, process-creation events, and network connections originating from the Wazuh server process for unexpected child processes, outbound callbacks, or anomalous serialized payloads. Because exploitation details are not fully public, treat any unexplained code execution on the server as potentially related until ruled out.

Confirm exact version ranges and detection guidance with the vendor advisory; do not rely solely on this summary.

How to remediate

Patch first. Apply the vendor-supplied update that addresses CVE-2025-24016 as soon as it is available and tested in your environment. Follow the installation and upgrade instructions published by Wazuh; CISA’s required action is to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

• After patching, restart the Wazuh server services and verify the new version is running.
• For the broader class of deserialization issues, ensure that any remaining input paths reject untrusted serialized data, prefer safer data formats (JSON, protobuf with schema validation, etc.), and run the service with least privilege.
• Rotate any credentials or API keys that may have been present on the server, and review agent enrollment and manager certificates for signs of tampering.

If you can't patch immediately

Until the official update can be applied, reduce exposure with compensating controls:

• Network segmentation: Restrict inbound access to the Wazuh server management and agent communication ports to only known, trusted agent subnets and administrative jump hosts. Block direct internet exposure.
• Virtual patching / WAF: If a web or API front-end is involved, deploy rules that drop or sanitize unexpected serialized content; confirm any signatures against the vendor’s guidance.
• Feature disablement: Where the advisory or configuration options allow, disable non-essential deserialization endpoints or integrations that accept untrusted data.
• Heightened monitoring: Enable detailed process, file, and network logging on the Wazuh server host; alert on new processes spawned by the Wazuh service, unexpected outbound connections, or changes to critical configuration files. Retain logs for forensic review.

These measures lower risk but do not eliminate it; schedule the vendor patch as the permanent fix.

If your data may have been exposed

Actively exploited remote-code-execution vulnerabilities can lead to full server compromise and subsequent data theft or lateral movement. Known ransomware use of this CVE is not documented, but any successful exploitation still warrants investigation of the host, review of collected security data for integrity, and credential rotation. As a quick personal check, you can run a free exposure scan of your email address against known breach data sets to see whether your credentials have appeared in prior incidents.