How severe is CVE-2023-34048?

CVE-2023-34048 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-34048 being actively exploited?

Yes. CVE-2023-34048 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-01-22, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-34048?

CVE-2023-34048 primarily affects Vmware Vcenter Server. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-34048?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2023-34048 have an EU (EUVD) identifier?

Yes. CVE-2023-34048 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-38166. It is also flagged as exploited in the EUVD (since 2024-01-22).

When was CVE-2023-34048 published?

CVE-2023-34048 was published on 2023-10-25 and last updated on 2026-06-17.

CVE-2023-34048

CVE-2023-34048 is a critical-severity vulnerability in Vmware Vcenter Server with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-01-22). The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 99% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2024-01-22)
EU (EUVD) id: EUVD-2023-38166
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-01-22)
Weakness: CWE-787
Affected product: Vmware Vcenter Server
Published: 2023-10-25
Last modified: 2026-06-17

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.

Frequently asked questions

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.
How severe is CVE-2023-34048?: CVE-2023-34048 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-34048 being actively exploited?: Yes. CVE-2023-34048 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-01-22, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2023-34048?: CVE-2023-34048 primarily affects Vmware Vcenter Server. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-34048?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2023-34048 have an EU (EUVD) identifier?: Yes. CVE-2023-34048 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-38166. It is also flagged as exploited in the EUVD (since 2024-01-22).
When was CVE-2023-34048 published?: CVE-2023-34048 was published on 2023-10-25 and last updated on 2026-06-17.

References

Affected products (37)

cpe:2.3:a:vmware:vcenter_server:*:*:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:-:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:a:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:b:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:c:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:d:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update1:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update1a:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update1c:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update1d:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update2:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update2a:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update2b:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update2c:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update2d:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3a:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3c:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3d:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3e:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3f:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3g:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3h:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3i:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3j:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3k:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3l:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3m:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:7.0:update3n:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:-:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:a:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:b:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:c:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:update1:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:update1a:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:update1b:*:*:*:*:*:*
cpe:2.3:a:vmware:vcenter_server:8.0:update1c:*:*:*:*:*:*

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