CVE-2023-20896

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-06-22 · updated 2026-06-17
Weakness: CWE-125

Description

The VMware vCenter Server contains an out-of-bounds read vulnerability in the implementation of the DCERPC protocol. A malicious actor with network access to vCenter Server may trigger an out-of-bounds read by sending a specially crafted packet leading to denial-of-service of certain services (vmcad, vmdird, and vmafdd).

Affected products

VMware vCenter Server: from 4.0 before 7.0; 7.0, 7.0-a, 7.0-b, 7.0-c, 7.0-d, 7.0-update1 (+26) — fixed in 7.0
VMware Cloud Foundation (vCenter Server): from 5.x before 7.0 U3m, 8.0 U1b; from 4.x before 7.0 U3m, 8.0 U1b — fixed in 7.0 U3m, 8.0 U1b
VMware vCenter Server (vCenter Server): from 8.0 before 8.0 U1b; from 7.0 before 7.0 u3m — fixed in 8.0 U1b, 7.0 u3m

How to fix

Upgrade to a fixed version: VMware vCenter Server 7.0; VMware Cloud Foundation (vCenter Server) 7.0 U3m, 8.0 U1b; VMware vCenter Server (vCenter Server) 8.0 U1b, 7.0 u3m. Check the vendor advisory for mitigations.

References

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