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Vulnerabilities

Vulnerability · CVE-2020-3976

VMware ESXi and vCenter Server contain a partial denial of service vulnerability in their respective authentication services.

Published Aug 21, 2020 · catalog updated Jun 17, 2026 · cloud foundation

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2020-3976. EPSS is 2.12%. Act only if a listed version of cloud foundation is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.12%
Remediation
Version ranges on file
Affected products
cpe vmware/cloud foundation · cpe vmware/vcenter server

VMware ESXi and vCenter Server contain a partial denial of service vulnerability in their respective authentication services. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.3.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe vmware/cloud foundation< 3.10
  • cpe vmware/cloud foundation< 4.0.1
  • cpe vmware/vcenter server6.5

How to fix CVE-2020-3976

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-3976. EPSS is 2.12%. Act only if a listed version of cloud foundation is installed.

Which versions are affected?

Compare what you have installed with vmware/cloud foundation < 3.10; vmware/cloud foundation < 4.0.1; vmware/vcenter server 6.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption. EPSS 2.12%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

VMware security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 21, 2020 · Monitored products — critical

    Detected

    VMware ESXi and vCenter Server contain a partial denial of service vulnerability in their respective authentication services. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.3.

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    VMware ESXi and vCenter Server contain a partial denial of service vulnerability in their respective authentication services. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.3.

Sources

  • CVE.orgVulnerability recordCVE-2020-3976

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2020-3976

    VMware ESXi and vCenter Server contain a partial denial of service vulnerability in their respective authentication services. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.3.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — criticalNov 4, 2026
  • CVE.orgNov 2, 2026