Exploited CVEs / VMware / CVE-2023-34048
CVE-2023-34048
VMware vCenter Server Out-of-Bounds Write Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2024-02-12 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Broadcom (VMware) Security Advisories, linked below.
Actively exploited VMware vCenter Server vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2024-01-22.
Risk summary
Updated July 28, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2023-34048
vCenter Server's DCERPC protocol implementation contains an out-of-bounds write allowing remote code execution against the machine that controls your entire virtual infrastructure. Notably, ransomware groups had quietly exploited it for years before it was recognized, and its January 2024 KEV listing with a 99 percent EPSS confirmed the scope. vCenter compromise means every ESXi host and VM is in reach, which is exactly how mass VM encryption events unfold.
Do this: Patch vCenter and remove any management interface exposure to the internet or general user networks, restricting access to a dedicated admin segment.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2023-34048
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2023-34048
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2024-02-12 (past due).
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2023-34048
The authoritative fix and affected-version list are published by the vendor. Find the vCenter Server advisory on Broadcom (VMware) Security Advisories.
Common questions about CVE-2023-34048
Is CVE-2023-34048 actively exploited?
Yes. CVE-2023-34048 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2024-01-22, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 99%.
What is the CISA deadline and required action for CVE-2023-34048?
CISA set the federal (BOD 22-01) remediation due date at 2024-02-12, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2023-34048?
The authoritative fix is in the vendor advisory: see Broadcom (VMware) Security Advisories for the patched vCenter Server versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2023-34048?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2023-34048's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
