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CVE-2023-34048: VMware vCenter Server Out-of-Bounds Write Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-01-22
• EPSS: 99.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-10-25 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• VMware vCenter Server: from 4.0 through 5.5; 7.0, 7.0-a, 7.0-b, 7.0-c, 7.0-d, 7.0-update1 (+30)
• VMware Cloud Foundation: from 4.0 before KB88287 — fixed in KB88287
• VMware vCenter Server: from 7.0 before 7.0U3o — fixed in 7.0U3o
• VMware vCenter Server: from 8.0 before 8.0U2; from 7.0 before 7.0U3o — fixed in 8.0U2, 7.0U3o
• VMware Cloud Foundation (VMware vCenter Server): 5.x, 4.x

How to fix

Upgrade to a fixed version: VMware Cloud Foundation KB88287; VMware vCenter Server 7.0U3o; VMware vCenter Server 8.0U2, 7.0U3o. Check the vendor advisory for mitigations.

References

• https://www.vmware.com/security/advisories/VMSA-2023-0023.html
• https://www.vicarius.io/vsociety/posts/understanding-cve-2023-34048-a-zero-day-out-of-bound-write-in-vcenter-server
• https://www.vmware.com/security/advisories/VMSA-2023-0023.html
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-34048

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