CVE-2026-32983 is a vulnerability identified in the Wazuh Manager's authd service, specifically in wazuh-manager packages up to version 4.7.3. The flaw stems from an improper restriction on client-initiated SSL/TLS renegotiation, classified under CWE-276 (Incorrect Default Permissions). The authd service does not limit the number of renegotiation requests a client can initiate, allowing a remote attacker to send excessive renegotiation attempts. This leads to high CPU consumption on the server side, effectively causing a denial of service (DoS) by exhausting processing resources and rendering the authd service unavailable. The vulnerability does not require any authentication or user interaction, making it easier to exploit remotely over the network. The CVSS 4.0 base score is 6.9, reflecting a medium severity level, with attack vector as network, low attack complexity, no privileges or user interaction required, and a limited impact on availability. The vulnerability affects the core component responsible for authentication in Wazuh Manager, a widely used open-source security monitoring platform. Although no exploits are currently known in the wild, the potential for disruption of security monitoring services is significant, especially in environments relying heavily on Wazuh for real-time threat detection and response. The lack of patch links suggests that a fix may not yet be publicly available, emphasizing the need for interim mitigations.

The primary impact of CVE-2026-32983 is a denial of service condition against the Wazuh Manager authd service, which can disrupt the availability of security monitoring and alerting functions. Organizations using vulnerable versions of wazuh-manager may experience service outages, delayed incident detection, and impaired response capabilities. This can lead to increased risk exposure as security events may go unnoticed or unaddressed. The attack requires no authentication, making it accessible to any remote attacker with network access to the authd service. The CPU exhaustion caused by excessive renegotiation requests can also degrade overall system performance, potentially affecting other services running on the same host. For critical infrastructure, government agencies, and enterprises relying on Wazuh for compliance and security operations, this vulnerability poses a risk to operational continuity and security posture. Although no known exploits exist currently, the vulnerability's characteristics make it a plausible target for denial of service attacks, especially in hostile or targeted environments.

1. Upgrade: Monitor Wazuh vendor advisories and apply patches or updates as soon as they become available to address this vulnerability. 2. Network Controls: Restrict network access to the authd service using firewalls or network segmentation to limit exposure to trusted clients only. 3. Rate Limiting: Implement rate limiting or connection throttling on the authd service or at the network perimeter to limit the number of SSL/TLS renegotiation requests accepted from a single client. 4. Monitoring: Continuously monitor CPU usage and authd service logs for unusual spikes in renegotiation attempts or resource consumption. 5. Temporary Workarounds: If patching is not immediately possible, consider disabling SSL/TLS renegotiation if supported by the service configuration or underlying TLS libraries, understanding this may impact legitimate client behavior. 6. Incident Response: Prepare to quickly restart or isolate the authd service if a denial of service is detected to minimize downtime. 7. Vendor Engagement: Engage with Wazuh support or community forums for any unofficial patches or recommended configuration changes to mitigate the issue until an official fix is released.