CVE-2023-34048 — Vmware Vcenter Server
CISA KEVAs of 2025-10-30, CVE-2023-34048 is a CRITICAL-severity vulnerability in Vmware Vcenter Server, CVSS v3.1 9.8, EPSS 93.2% (99.8th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-01-22), with a US federal remediation deadline of 2024-02-12. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2023-34048, most recently “UNC3886 Zero-Day Rootkit Campaign Targeting Singaporean Telecommunications — ORB Network C2, Fortinet/VMware Exploitation, Covert Infrastructure Persistence”.
Last updated: 2025-10-30
What is CVE-2023-34048?
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.
The record classifies CVE-2023-34048 under weakness class CWE-787. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 37 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1054 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 93.2% probability of exploitation in the next 30 days, higher than 99.8% of all scored CVEs
- CISA KEV
- Listed since 2024-01-22, federal remediation deadline 2024-02-12
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2023-10-25, last modified 2025-10-30
Is CVE-2023-34048 being exploited?
CISA added CVE-2023-34048 to the Known Exploited Vulnerabilities catalog on 2024-01-22, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2024-02-12 under BOD 22-01. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.
Affected products and versions
- Vmware: Vcenter Server, Vcenter Server 7.0, Vcenter Server 8.0
Showing 3 of 37 recorded product entries.
How to fix CVE-2023-34048
The record marks a vendor fix as available for CVE-2023-34048. Patch reference: https://www.vmware.com/security/advisories/VMSA-2023-0023.html. Vendor advisory: https://www.vmware.com/security/advisories/VMSA-2023-0023.html. Because CVE-2023-34048 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2024-02-12. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2023-34048
2 tracked threats in the Threadlinqs corpus reference CVE-2023-34048, either in the campaign’s CVE list or as an indicator on the campaign record.
- UNC3886 Zero-Day Rootkit Campaign Targeting Singaporean Telecommunications — ORB Network C2, Fortinet/VMware Exploitation, Covert Infrastructure Persistence — CRITICAL · 2026-03-13
- CL-UNK-1068: China-Nexus APT Targeting Critical Infrastructure via DLL Sideloading, Xnote Backdoor, ScanPortPlus Scanner, and FRP Tunneling — HIGH · 2026-03-06
Sources
Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.
← all vulnerabilities · Markdown version · Threadlinqs Intelligence