# CVE-2025-62623: AMD ionic cloud driver heap overflow in VMware ESXi

Source: https://junglewise.ai/threats/cve-2025-62623-amd-ionic-cloud-driver-heap-overflow-in-vmware-esxi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-13. Updated: 2026-05-14  
License: CC BY 4.0 with a link back

CVE-2025-62623 · Severity: info · CVSS 8.8 · Published 2026-05-13

A security vulnerability has been identified in the AMD ionic cloud driver used within VMware ESXi virtualization environments. This flaw could allow a user with low-level access to gain higher administrative privileges on the host system. If successfully exploited, an attacker could potentially take full control of the server, leading to unauthorized data access or disruption of virtualized services.

Technologies: [Amd ionic cloud driver for VMware ESXi](https://junglewise.ai/threats/technologies/ionic-cloud-driver-for-vmware-esxi). Vendors: [Amd](https://junglewise.ai/threats/vendors/amd).

## Quick answers

**Is CVE-2025-62623 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-62623 being exploited in the wild.

**How severe is CVE-2025-62623?** Informational severity, with a CVSS score of 8.8, published 13 May 2026.

**Which products and versions are affected?** AMD ionic cloud driver for VMware ESXi.

**Is there a fix for CVE-2025-62623?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-62623 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2025-62623?** Check whether you run Amd ionic cloud driver for VMware ESXi. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow vulnerability (CWE-119) exists in the AMD ionic cloud driver for VMware ESXi. The flaw is triggered when the driver improperly restricts operations within the bounds of a memory buffer. An attacker with local access and low privileges could exploit this vulnerability to escalate their privileges to a higher level. Successful exploitation could lead to arbitrary code execution within the context of the ESXi hypervisor. The attack complexity is rated as high, suggesting specific timing or environmental conditions may be required for a successful exploit.

## Affected products

- AMD ionic cloud driver for VMware ESXi

## Timeline

- 2026-05-13: disclosed: Initial disclosure by AMD and NVD publication.

## References

- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-2001.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-2001.html)

## Related threats

- [AMD ionic cloud driver untrusted pointer dereference in VMWare ESXi](https://junglewise.ai/threats/cve-2025-62627-amd-ionic-cloud-driver-untrusted-pointer-dereference-in-vmware)
- [AMD ionic cloud driver heap overflow in VMware ESXi](https://junglewise.ai/threats/cve-2025-62624-amd-ionic-cloud-driver-heap-overflow-in-vmware-esxi)