dbcve.org
Heap-based Buffer OverflowWeakness · CWE-122

CVE-2025-62624

HIGH · 8.8 CVSS v4.0 Published 2026-05-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
90/100
Remediation priority · Urgent
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A heap-based buffer overflow in the ionic cloud driver for VMware ESXi could allow an attacker to achieve privilege escalation, potentially resulting in arbitrary code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A heap-based buffer overflow vulnerability exists in the ionic cloud driver for VMware ESXi. This driver-level flaw allows a local or adjacent attacker to perform privilege escalation, potentially executing arbitrary code with elevated privileges on the hypervisor.

MitigationApply the official VMware patch for the ionic cloud driver when released; verify ESXi versions in use and implement the update during a scheduled maintenance window.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
High
Privileges
Low
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify if ionic cloud driver is loaded on ESXi host
    Run 'esxcli system module list' or check /etc/vmware/esx.conf for ionic driver entries to see if the ionic cloud driver module is loaded
    Affected if ionic cloud driver module is present and loaded on the ESXi host
  2. Determine ESXi host version
    Run 'vmware -v' or check the Summary tab in vSphere Client to obtain the full ESXi version build number
    Affected if ESXi version falls within any affected range (compare against official VMware advisory when released)
  3. Check ionic driver version
    Run 'esxcli system module get -m ionic' to retrieve the ionic cloud driver module version information
    Affected if ionic driver version is lower than the patched version in the VMware advisory
  4. Review driver configuration and usage
    Check 'esxcli network nic list' and inspect any VMkernel adapters or cloud configurations that utilize the ionic driver for network or storage cloud connectivity
    Affected if The ionic driver is actively configured or in use for cloud storage/networking operations
  5. Audit host access and adjacent network exposure
    Review ESXi host management network access controls and verify whether untrusted local or adjacent network attackers could reach the ESXi management interface
    Affected if Host has permissive access controls allowing local or adjacent attackers to interact with the ionic driver interface

The environment is affected if an ESXi host has the ionic cloud driver loaded and running a version below the patched version specified in the VMware security advisory for CVE-2025-62624.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the official VMware patch for the ionic cloud driver when released; verify ESXi versions in use and implement the update during a scheduled maintenance window.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing6.0 h
  • Review / QA3.0 h
19.0 hours of engineering $3,320
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-62624 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data