VMware vCenter Server Out-of-Bounds Write Vulnerability (CVE-2023-34048) | HOL Guard CVE

High severityKnown ExploitedCVE-2023-34048

VMware vCenter Server Out-of-Bounds Write Vulnerability

Answer in brief

CVE-2023-34048 records a High severity vulnerability in VMware vCenter Server Out-of-Bounds Write Vulnerability. The current sources mark it as known exploited. The current feed maps vmware/cloud_foundation (generic), vmware/cloud_foundation (generic), vmware/vcenter_server (generic), vmware/vcenter_server (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 25, 2023Updated Oct 21, 2025Source checked Sep 17, 2026First seen by HOL May 24, 2026Material review Oct 21, 2025

Upstream Advisory

Key facts

Risk: High
Exploitation: Known exploited
Affected software: 6 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps vmware/cloud_foundation (generic), vmware/cloud_foundation (generic), vmware/vcenter_server (generic), vmware/vcenter_server (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
vmware/cloud_foundationgeneric	>=4.0 <KB88287	KB88287
vmware/cloud_foundationgeneric	>=5.0 <KB88287	KB88287
vmware/vcenter_servergeneric	>=8.0 <8.0U2	8.0U2
vmware/vcenter_servergeneric	>=7.0 <7.0U3o	7.0U3o
VMware/VMware Cloud Foundation (VMware vCenter Server)generic	5.x \|\| 4.x	Not reported
VMware/VMware vCenter Servergeneric	>=8.0 <8.0U2 \|\| >=7.0 <7.0U3o	8.0U2, 7.0U3o

Recommended response

Check inventory. Check lockfiles and deployed manifests for vmware/cloud_foundation, vmware/cloud_foundation, vmware/vcenter_server.
Review the reported fix. Update vmware/cloud_foundation to KB88287; vmware/cloud_foundation to KB88287; vmware/vcenter_server to 8.0U2; vmware/vcenter_server to 7.0U3o; VMware/VMware vCenter Server to 8.0U2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 25, 2023
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
May 24, 2026
Added to CISA KEV
Jan 22, 2024
Evidence: source:kev:kev:kev:record

Sources and claim methodology

Upstream source description

vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol. A malicious actor with network access to vCenter Server may trigger an out-of-bounds write potentially leading to remote code execution.

Quoted source text, attributed separately from HOL analysis.