What is the CVSS score of CVE-2023-34048?

CVE-2023-34048 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 93.2%.

Is there a public PoC exploit available for CVE-2023-34048?

Yes, a public proof-of-concept exploit is available for CVE-2023-34048. Prioritise patching immediately. EPSS: 93.2%.

How to fix or mitigate CVE-2023-34048?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. If patching is delayed, consider network segmentation to limit exposure.

CVE-2023-34048

CRITICAL

Out-of-bounds Write (CWE-787)

2023-10-25 security@vmware.com

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 26, 2026 - 11:19 vuln.today

Added to CISA KEV

Oct 30, 2025 - 19:52 cisa

CISA KEV

PoC Detected

Oct 30, 2025 - 19:52 vuln.today

Public exploit code

CVE Published

Oct 25, 2023 - 18:17 nvd

CRITICAL 9.8

DescriptionCVE.org

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.

AnalysisAI

VMware vCenter Server contains an out-of-bounds write in the DCERPC protocol implementation allowing unauthenticated remote code execution, exploited by Chinese APT groups for ESXi infrastructure compromise.

Technical ContextAI

The CWE-787 out-of-bounds write in the DCERPC protocol implementation allows a network-adjacent attacker to corrupt memory through crafted protocol messages. The exploitation requires only network access to the vCenter Server's DCERPC port (port 443 for vSphere Client embeds DCERPC handling).

Affected ProductsAI

VMware vCenter Server (affected versions before patches)

RemediationAI

Apply VMware security patches immediately. Check ESXi hosts for indicators of VirtualPita/VirtualPie. Restrict network access to vCenter management interfaces. Implement vCenter Server High Availability (VCHA) for detection.