CVE-2024-37085 is an authentication bypass vulnerability in VMware ESXi. CISA added it to the Known Exploited Vulnerabilities catalogue on 30 July 2024, which means attackers have used it in real attacks. VMware ESXi contains an authentication bypass vulnerability. Organisations running the affected product should apply the vendor fix or mitigation as a priority.
What this vulnerability means in an ESXi environment
An authentication bypass in a hypervisor is especially serious because ESXi sits close to the operating system, virtual machines and management plane. When login controls fail, an attacker may be able to reach administrative functions without the intended identity check, turning a single flaw into broad host-level exposure.
For a virtualisation platform, the practical concern is not just one compromised server, but the potential to affect many workloads that share the same host. Organisations should treat the vendor advisory and the CISA Known Exploited Vulnerabilities catalogue as the authoritative sources for affected scope and remediation details, rather than relying on secondary summaries.
Why authentication bypasses are dangerous in virtualisation platforms
Authentication bypasses are dangerous because they remove the gate that separates unauthorised network reachability from privileged control. In a management product like ESXi, that can expose configuration changes, virtual machine operations, and other administrative actions that were supposed to require a valid login.
The danger increases when the product is internet-reachable, exposed through management interfaces, or used in concentrated estates where one host supports many critical systems. A bypass on infrastructure software can therefore become a force multiplier for disruption, data access, or follow-on compromise.
How organisations should assess exposure and respond
Exposure review should start with a complete inventory of ESXi instances, the versions in use, and whether management interfaces are reachable from networks that an attacker could access. If the environment is large or distributed, correlate asset inventory with vendor guidance and any external exposure data so that patching and mitigation are prioritised where the risk is highest.
Where immediate patching is not possible, reduce exposure by limiting management-plane access, tightening administrative network paths, and applying any vendor-approved mitigation. After any remediation step, verify that the fix is actually in place and that the host is still operating as intended.
Detection, compromise review, and identity impact
Because this class of issue can be actively exploited, defenders should review authentication logs, management activity, and any signs that administrative access occurred without a normal login sequence. Post-patch review matters as much as remediation, because an attacker who used the bypass may already have changed settings, added access, or staged persistence.
If exploitation is suspected, treat credentials, privileged sessions and related administrative access material as potentially exposed. Rotate any secrets or accounts that could have been used to manage the host, and inspect adjacent systems for signs that the attacker moved beyond the ESXi layer.
Risk and Threat Considerations
An authentication bypass on a hypervisor creates direct risk of unauthorised administrative access, which can cascade into virtual machine tampering, downtime, data exposure, or broader infrastructure compromise. The threat is most severe when management interfaces are reachable from untrusted networks or when one host concentrates many critical workloads.
Failure mechanism: The attacker skips the intended login control and reaches privileged host functions as if authenticated, which can make the compromise look like routine administration unless logs and host state are reviewed carefully.
Impact: Successful exploitation can enable host takeover, workload disruption, lateral movement into connected systems, and in some cases the need to rebuild or revalidate affected virtual infrastructure.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8 and NIST SP 800-53 Rev 5 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | CVE remediation depends on identifying and prioritising vulnerable ESXi hosts. |
| Recommendation — Prioritise ESXi hosts in your vulnerability management workflow and verify remediation after patching. | ||
| NIST SP 800-53 Rev 5 | IA-2 — Identification and Authentication (Organizational Users) | Authentication bypass directly undermines user authentication controls on the ESXi management plane. |
| AU-6 — Audit Review, Analysis, and Reporting | Post-exploitation review relies on analysing logs and management activity for abnormal access. | |
| SC-7 — Boundary Protection | Restricting access to management interfaces helps contain exploitation of a bypass flaw. | |
| Recommendation — Enforce strong administrative authentication on ESXi management access and validate it after remediation. Review ESXi audit records for signs of unauthorised administrative access after remediation. Restrict ESXi management interfaces to trusted networks and administrative paths only. | ||
| ISO/IEC 27001:2022 | A.8.8 — Management of technical vulnerabilities | The term requires vulnerability identification, prioritisation and remediation of affected systems. |
| Recommendation — Track the ESXi flaw as a technical vulnerability and confirm corrective action through change control. | ||
Practitioner Guidance
Why practitioners should care: CVE-2024-37085 is not just a patching item, it is a management-plane trust failure on infrastructure that often underpins many business services. The right response is to prioritise the host estate, not to treat each server as an isolated endpoint.
What to watch for: Pay special attention to any ESXi host that is externally reachable, administered through shared credentials, or operated in a cluster where one compromised node could affect multiple workloads. Those conditions make authentication bypass flaws materially harder to contain.
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org