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CVE-2023-34048

VMware vCenter Server Out-of-Bounds Write

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 99.4%
  1. Published25 Oct 2023
  2. Added to CISA KEV22 Jan 2024
  3. Remediation due12 Feb 2024
Actively exploited (CISA KEV)

VMware vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol that allows an attacker to conduct remote code execution.

Added to KEV: 22 Jan 2024Federal remediation due: 12 Feb 2024

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VMware Vcenter Server≥ 4.0 ≤ 5.5 · 7.0 · 8.0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2023-34048 being actively exploited?

Yes. CVE-2023-34048 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 22 Jan 2024.

How severe is CVE-2023-34048?

CVE-2023-34048 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.4% probability of exploitation.

Which products are affected by CVE-2023-34048?

Affected products include VMware Vcenter Server.

How do I fix CVE-2023-34048?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-34048 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.