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Vulnerabilities

Vulnerability · CVE-2021-22050

ESXi contains a slow HTTP POST denial-of-service vulnerability in rhttpproxy.

Published Feb 16, 2022 · catalog updated Jun 17, 2026 · cloud foundation

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-22050. EPSS is 2.32%. 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
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.32%
Remediation
Version ranges on file
Affected products
cpe vmware/cloud foundation · cpe vmware/esxi

ESXi contains a slow HTTP POST denial-of-service vulnerability in rhttpproxy. A malicious actor with network access to ESXi may exploit this issue to create a denial-of-service condition by overwhelming rhttpproxy service with multiple requests.

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< 3.11
  • cpe vmware/cloud foundation< 4.4
  • cpe vmware/esxi6.5
  • cpe vmware/esxi6.7

How to fix CVE-2021-22050

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-2021-22050. EPSS is 2.32%. Act only if a listed version of cloud foundation is installed.

Which versions are affected?

Compare what you have installed with vmware/cloud foundation < 3.11; vmware/cloud foundation < 4.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 2.32%. 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. Feb 16, 2022 · Monitored products — critical

    Detected

    ESXi contains a slow HTTP POST denial-of-service vulnerability in rhttpproxy. A malicious actor with network access to ESXi may exploit this issue to create a denial-of-service condition by overwhelming rhttpproxy service with multiple requests.

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    ESXi contains a slow HTTP POST denial-of-service vulnerability in rhttpproxy. A malicious actor with network access to ESXi may exploit this issue to create a denial-of-service condition by overwhelming rhttpproxy service with multiple requests.

Sources

  • CVE.orgVulnerability recordCVE-2021-22050

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2021-22050

    ESXi contains a slow HTTP POST denial-of-service vulnerability in rhttpproxy. A malicious actor with network access to ESXi may exploit this issue to create a denial-of-service condition by overwhelming rhttpproxy service with multiple requests.

    nvd.nist.gov
  • AlienVault OTXThreat intelligenceCVE-2021-22050
    otx.alienvault.com

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 5, 2026
  • AlienVault OTXNov 2, 2026
  • CVE.orgNov 2, 2026