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Back to active CVEs
Critical · CVSS 9.8Known ExploitedCVE-2023-34048

VMware vCenter Server Out-of-Bounds Write VulnerabilityCVE-2023-34048

Answer in brief

CVE-2023-34048 records a Critical severity (CVSS 9.8) 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 Nov 1, 2026First seen by HOL May 24, 2026Material review Oct 21, 2025
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Known exploited
Affected software
6 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. 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
PackageAffected rangeFixed version
vmware/cloud_foundationgeneric>=4.0 <KB88287KB88287
vmware/cloud_foundationgeneric>=5.0 <KB88287KB88287
vmware/vcenter_servergeneric>=8.0 <8.0U28.0U2
vmware/vcenter_servergeneric>=7.0 <7.0U3o7.0U3o
VMware/VMware Cloud Foundation (VMware vCenter Server)generic5.x || 4.xNot reported
VMware/VMware vCenter Servergeneric>=8.0 <8.0U2 || >=7.0 <7.0U3o8.0U2, 7.0U3o

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for vmware/cloud_foundation, vmware/cloud_foundation, vmware/vcenter_server.
  2. 2Review 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

  1. Published upstream

    Oct 25, 2023

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    May 24, 2026

  4. Added to CISA KEV

    Jan 22, 2024

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • CISA Known Exploited Vulnerabilities catalogcisa.gov
  • Source referencevicarius.io
  • Source referencevmware.com
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.

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 1, 2026
References
3 linked sources
Open source record