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CVE-2023-34048· NVD / CVE Program· CNA vmware

VMware vCenter Server Out-of-Bounds Write Vulnerability

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.

CriticalCVSS 9.8 · v3.1KEVWeaponized Fix available
Published
Oct 25, 2023
Updated
Jun 17, 2026
EPSS
99.4% · 100th percentile
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Action score

99

Now

Patch today or shut off access.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
30 / 30 · 99.4%

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 government agencies: Feb 12, 2024.

Affected systems

VendorProduct
vmwarevcenter server

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

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

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 plKEV
    99Now
  • CVE-2020-3952Under certain conditions, vmdir that ships with VMware vCenter Server, as part of an embedded or external Platform Services Controller (PSC)KEV
    96Now
  • CVE-2026-59310vCenter directory-traversal vulnerabilityKEV
    70This week
  • CVE-2015-2342The JMX RMI service in VMware vCenter Server 5.0 before u3e, 5.1 before u3b, 5.5 before u3, and 6.0 before u1 does not restrict registration
    67This week
  • CVE-2021-22017Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.KEV
    66This week
  • CVE-2023-20894The VMware vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol.
    49Plan

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
VMware VMware vCenter Server7.0U3oVendor (CNA)
VMware VMware vCenter Server8.0U2Vendor (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
SourceKindDate
Nuclei detection templateNuclei 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.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+88 d
  3. TodaySep 29, 2026+1070 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-20894125 days apartThe VMware vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol.
    49Plan
  • CVE-2024-37080237 days apartvCenter Server contains a heap-overflow vulnerability in the implementation of the DCERPC protocol.
    43Plan
  • CVE-2023-20892125 days apartVMware vCenter Server heap-overflow vulnerability
    40Plan
  • CVE-2023-20895125 days apartThe VMware vCenter Server contains a memory corruption vulnerability in the implementation of the DCERPC protocol.
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • 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.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records