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Findings

CVE-2020-3992

VMware ESXi OpenSLP Use-After-Free Vulnerability

Published Oct 20, 2020 · updated Aug 11, 2026 · vmware cloud foundation

OpenSLP as used in VMware ESXi (7.0 before ESXi_7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG) has a use-after-free issue. A malicious actor residing in the management network who has access to port 427 on an ESXi machine may be able to trigger a use-after-free in the OpenSLP service resulting in remote code execution.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2020 · Catalog

    Detected

    OpenSLP as used in VMware ESXi (7.0 before ESXi_7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG) has a use-after-free issue. A malicious actor residing in the management network who has access to port 427 on an ESXi machine may be able to trigger a use-after-free in the OpenSLP service resulting in remote code execution.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Aug 11, 2026 · Catalog

    Updated

    OpenSLP as used in VMware ESXi (7.0 before ESXi_7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG) has a use-after-free issue. A malicious actor residing in the management network who has access to port 427 on an ESXi machine may be able to trigger a use-after-free in the OpenSLP service resulting in remote code execution.

Required action

Apply updates per vendor instructions.

CISA due date May 3, 2022

Affected

  • cpe vmware/cloud foundationversion unspecified
  • cpe vmware/esxi6.5
  • vendor VMware ESXiversion unspecified

Sources

  • CISA KEVCVE-2020-3992

    VMware ESXi OpenSLP contains a use-after-free vulnerability that allows an attacker residing in the management network with access to port 427 to perform remote code execution.

    cisa.gov
  • CVE.orgCVE-2020-3992

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2020-3992

    30-day exploitation probability 83.0%

    first.org
  • NIST NVDCVE-2020-3992

    OpenSLP as used in VMware ESXi (7.0 before ESXi_7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG) has a use-after-free issue. A malicious actor residing in the management network who has access to port 427 on an ESXi machine may be able to trig

    nvd.nist.gov

References