CVE-2023-34048 kev in the critical feed json
VMware vCenter Server Out-of-Bounds Write Vulnerability
published 2023-10-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-38166
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2024-01-22
- epss
- 99.2%
- EPSS 99.2% chance of exploitation in 30 days, percentile 99.9%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- VMware VMware vCenter Server 7.0U3o, 8.0U2
- vmware vcenter_server 7.0U3o, 8.0U2
- vmware cloud_foundation KB88287
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 2 y ago
- Patch by
- 2024-02-12 (2 y ago)
- Ransomware
- Not known
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Vendor, product
- VMware, vCenter Server
- CISA name
- VMware vCenter Server Out-of-Bounds Write Vulnerability
ATT&CK techniques
How it is exploited and what it leads to, in MITRE ATT&CK terms.
kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
99.23% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template VMware vCenter Server - Out-of-Bounds Write nuclei detection template
- vicarius.io https://www.vicarius.io/vsociety/posts/understanding-cve-2023-34048-a-zero-day-out-of-bound-write-in-vcenter-server referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- VMware VMware vCenter Server
- VMware VMware Cloud Foundation (VMware vCenter Server)
- vmware vcenter_server
- vmware cloud_foundation
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
- Technology feeds
References
-
vicarius.io
/vsociety/posts/understanding-cve-2023-34048-a-zero-day-out-of-bound-write-in-vcenter-server
exploit, third-party-advisory
-
vmware.com
/security/advisories/VMSA-2023-0023.html
vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-34048
government-resource, us-government-resource
Sources
- CVE List CVE-2023-34048
- NVD CVE-2023-34048
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.