CVE-2023-34048

CVE-2023-34048 is a critical-severity (CVSS 9.8) vulnerability in VMware vCenter Server. CISA added it to the Known Exploited Vulnerabilities catalog on January 22, 2024, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by February 12, 2024. CISA does not currently list it as used in ransomware campaigns. VMware has 26 vulnerabilities in the KEV catalog, 9 of them linked to ransomware.

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• 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