How severe is CVE-2023-34048?

CVE-2023-34048 has a CVSS 3.1 base score of 9.8 (CRITICAL). EPSS estimates a 99.4% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

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

CISA Known Exploited Vulnerabilities

VMware vCenter Server Out-of-Bounds Write Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2024-01-22

Remediation due

2024-02-12

Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA notes
https://www.vmware.com/security/advisories/VMSA-2023-0023.html; https://nvd.nist.gov/vuln/detail/CVE-2023-34048

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.

Severity

CVSS 3.1 · CNA9.8 CRITICAL

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Exploitation Context

as of October 15, 2026

All KEV statistics→

CISA added CVE-2023-34048 to the KEV catalog 89 days after its CVE record was published. The median for entries added in 2024 is 21.5 days.
It is one of 33 VMware entries in the CISA KEV catalog, and one of 5 added in 2024.
Its current EPSS score (99.4%) is higher than that of 88% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
VMware	VMware VMware vCenter Server	8.0 to <8.0U2 7.0 to <7.0U3o
VMware	VMware VMware Cloud Foundation (VMware vCenter Server)	5.x 4.x

References

2 Links

Other references

Record Details

Published

2023-10-25

Last updated

2025-10-21

Assigner (CNA)

vmware

Credited to

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.