CVE-2023-34048
VMware vCenter Server Out-of-Bounds Write Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 12 February 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 99.23% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 22 January 2024 · due 12 February 2024
- Weakness
- CWE-787
- Affected
- vmware/vcenter server
- Source
- security@vmware.com
EPSS 99.2% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. https://www.vmware.com/security/advisories/VMSA-2023-0023.html; https://nvd.nist.gov/vuln/detail/CVE-2023-34048
References
- https://www.vmware.com/security/advisories/VMSA-2023-0023.htmlVendor Advisory
- https://www.vicarius.io/vsociety/posts/understanding-cve-2023-34048-a-zero-day-out-of-bound-write-in-vcenter-serverExploit, Third Party Advisory
- https://www.vmware.com/security/advisories/VMSA-2023-0023.htmlVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-34048US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.