VMware vCenter Server up to 6.5 U2/6.7 U2/8.0 U1 DCERPC Protocol out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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9.7$25k-$100k0.00

Summaryinfo

A vulnerability, which was classified as very critical, has been found in VMware vCenter Server up to 6.5 U2/6.7 U2/8.0 U1. This affects an unknown function of the component DCERPC Protocol Handler. The manipulation leads to out-of-bounds write. This vulnerability is documented as CVE-2023-34048. The attack can be initiated remotely. Additionally, an exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in VMware vCenter Server up to 6.5 U2/6.7 U2/8.0 U1 (Server Management Software). It has been rated as very critical. This issue affects an unknown functionality of the component DCERPC Protocol Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 10/25/2023 as VMSA-2023-0023. It is possible to read the advisory at vmware.com. The identification of this vulnerability is CVE-2023-34048 since 05/25/2023. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $25k-$100k at the moment (estimation calculated on 10/31/2025).

It is declared as attacked. We expect the 0-day to have been worth approximately $25k-$100k. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 01/22/2024 with a due date of 02/12/2024:

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

Applying the patch 6.5 U3/6.7 U3o/8.0 U1d/8.0 U2 is able to eliminate this problem. The bugfix is ready for download at customerconnect.vmware.com.

The vulnerability is also documented in the vulnerability database at Zero-Day.cz (852). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.7

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector (VMware): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Zero-Day.cz: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 6.5 U3/6.7 U3o/8.0 U1d/8.0 U2

Timelineinfo

05/25/2023 🔍
10/25/2023 +153 days 🔍
10/25/2023 +0 days 🔍
10/31/2025 +736 days 🔍

Sourcesinfo

Vendor: vmware.com

Advisory: VMSA-2023-0023
Status: Confirmed

CVE: CVE-2023-34048 (🔍)
GCVE (CVE): GCVE-0-2023-34048
GCVE (VulDB): GCVE-100-243251
scip Labs: https://www.scip.ch/en/?labs.20060413

Entryinfo

Created: 10/25/2023 07:26
Updated: 10/31/2025 00:17
Changes: 10/25/2023 07:26 (42), 11/15/2023 14:38 (1), 11/15/2023 14:41 (11), 04/30/2024 12:10 (26), 06/06/2024 02:07 (2), 08/14/2024 22:45 (12), 09/09/2024 22:30 (1), 10/31/2025 00:17 (1)
Complete: 🔍
Cache ID: 216:F6D:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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