CVE-2023-20894· NVD / CVE Program· CNA vmware

The VMware vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol.

The VMware 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-bound write by sending a specially crafted packet leading to memory corruption.

CriticalCVSS 9.8 · v3.1—No exploit Fix available

BDU:2023-03928

Published: Jun 22, 2023
Updated: Jun 17, 2026
EPSS: 33.9% · 98th percentile
CWE: CWE-787

Follow this CVE

Report tools

JSON

Action score

Plan

Add it to your regular patch cycle.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 10 / 30 · 33.9%

CISA SSVC decision

Exploitation: proof of concept
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.8
CNA · vmware: 8.1; 1.7 point gap

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

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

Affected systems

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

Affected versions

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

vmware vcenter serverbefore 7.0
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 (vCenter Server)
- 5.x and later · before 7.0 U3m, 8.0 U1baffected · 7.0 U3m, 8.0 U1b
- 4.x and later · before 7.0 U3m, 8.0 U1baffected · 7.0 U3m, 8.0 U1b
VMware VMware vCenter Server (vCenter Server)
- 8.0 and later · before 8.0 U1baffected · 8.0 u1b
- 7.0 and later · before 7.0 u3maffected · 7.0 u3m

Same product

vmware: all records

Other highest-scoring records for the same primary product.

CVE-2023-34048VMware vCenter Server Out-of-Bounds Write VulnerabilityKEV
99Now
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

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 Cloud Foundation (vCenter Server)	7.0 U3m, 8.0 U1b	Vendor (CNA)
VMware VMware vCenter Server (vCenter Server)	7.0 u3m	Vendor (CNA)
VMware VMware vCenter Server (vCenter Server)	8.0 U1b	Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

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.

No nightly-computed relations.

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

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

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