Wazuh
CVE-2026-54084
MEDIUM
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
AV:N because the attack traverses the network; AC:H because MITM positioning or absent CA configuration is required; UI:R because the agent must actively initiate enrollment; A:H because the agent process terminates deterministically.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
NULL pointer dereference in Wazuh agent enrollment (versions 4.0.0-4.14.6) allows a network-positioned attacker operating a rogue manager or performing a man-in-the-middle attack to deterministically crash the agent process by supplying a malformed key response containing fewer than four space-separated fields. The flaw resides in w_enrollment_process_agent_key() in src/shared/enrollment_op.c, which passes unvalidated NULL entries from OS_StrBreak() directly into OS_IsValidName(), where an unguarded strlen() call on a NULL pointer terminates the agent. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two conditions must be met simultaneously. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.3 (Medium) rating appropriately reflects the constrained attack surface: AV:N establishes a network-reachable entry point, but AC:H captures the prerequisite of either a MITM position during the enrollment handshake or a rogue manager that the agent will connect to without certificate verification. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Wazuh agents to version 4.14.7, which introduces explicit NULL checks for all four parsed enrollment key fields before invoking `OS_IsValidID()` and `OS_IsValidName()`, as confirmed by the upstream commit at https://github.com/wazuh/wazuh/commit/7dfbb4a292bc6ae8e3bb4c1982f687f35216a748. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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