NVD / CVE Program· CNA vmware

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

CriticalCVSS 9.8 · v3.1KEVWeaponized Fix available

Noroxi assessment

Priority: Now (action score 99/100)

CISA has confirmed exploitation in the wild (Jan 22, 2024). Remediation deadline for US federal agencies: Feb 12, 2024.
A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 99.2% (FIRST EPSS); higher than 99.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: VMware VMware vCenter Server 7.0U3o, 8.0U2.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Upgrade to VMware VMware vCenter Server 7.0U3o, 8.0U2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

BDU:2023-07140

Published: Oct 25, 2023
Updated: Jun 17, 2026
EPSS: 99.2% · 99th percentile
CWE: CWE-787

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 30 / 30 · 99.2%

CISA SSVC decision

Exploitation: active
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.8
CNA · vmware: 9.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Jan 22, 2024. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Feb 12, 2024.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
vmware	vcenter server	cpe:2.3:a:vmware:vcenter_server

Versions reported by the vendor

Affected version ranges reported by the assigning authority (vmware). Independent of NVD's CPE analysis and usually ahead of it.

VMware VMware Cloud Foundation (VMware vCenter Server)
- 5.x, 4.xaffected
VMware VMware vCenter Server
- 8.0 and later · before 8.0U2affected · 8.0U2
- 7.0 and later · before 7.0U3oaffected · 7.0U3o

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

vmware vcenter server4.0 and later · up to 5.5 inclusive
vmware vcenter server7.0
vmware vcenter server8.0

Same product

vmware: all records

Other highest-scoring records for the same primary product.

CVE-2021-21985The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check…KEV
99Now
CVE-2020-3952Under certain conditions, vmdir that ships with VMware vCenter Server, as part of an embedded or external Platform Services Controller…KEV
96Now
CVE-2026-59310vCenter directory-traversal vulnerabilityKEV
88Now

Published before and after this one in the same product

← EarlierCVE-2023-20895Jun 22, 2023 · The VMware vCenter Server contains a memory corruption vulnerability in the implementation of the DCERPC protocol.
39Monitor
← EarlierCVE-2023-20896Jun 22, 2023 · The VMware vCenter Server contains an out-of-bounds read vulnerability in the implementation of the DCERPC protocol.
30Monitor
Later →CVE-2023-34056Oct 25, 2023 · VMware vCenter Server Partial Information Disclosure Vulnerability
17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
VMware VMware vCenter Server	7.0U3o	Vendor (CNA)
VMware VMware vCenter Server	8.0U2	Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Nuclei detection template ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Nuclei detection template	Nuclei template CVE-2023-34048	—

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.