CVE-2026-54084
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
Wazuh versions 4.0.0 through 4.14.6 are vulnerable to a crash during agent enrollment when a malicious enrollment manager returns a malformed key response with fewer than four fields, causing a NULL pointer dereference. Fixed in version 4.14.7.
Risk Assessment
An attacker can cause denial of service of Wazuh agents, potentially disrupting security monitoring and incident response.
Recommendation
Upgrade Wazuh to version 4.14.7 or later and configure CA certificate verification for the enrollment manager.
Original NVD description (English source)
Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. In versions 4.0.0 through 4.14.6, a malicious or man-in-the-middle enrollment manager can crash a Wazuh agent during enrollment by returning a malformed key response with fewer than four fields, causing a NULL pointer dereference. The w_enrollment_process_agent_key() routine splits the manager-provided key into four space-separated fields but does not verify that all fields are present before passing them to validators. Because OS_StrBreak() leaves missing trailing entries as NULL and OS_IsValidName() calls strlen() on its argument without a NULL check, a response such as OSSEC K:'1' reaches OS_IsValidName(NULL) and terminates the agent process. Since Wazuh permits enrollment against an unverified manager when no CA certificate is configured, an attacker operating a rogue manager or intercepting the enrollment flow can deterministically crash agents, resulting in denial of service. This issue is fixed in version 4.14.7.