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Vulnerabilities

Vulnerability · CVE-2021-22017

VMware vCenter Server Improper Access Control

Published Sep 23, 2021 · catalog updated Jun 16, 2026 · VMware vCenter Server

Patch now

CVE-2021-22017 is in the CISA known-exploited catalog, due Jan 24, 2022. Confirm VMware vCenter Server against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Medium5.3
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
49.18%
Remediation
Remediation guidance
Affected products
cpe vmware/vcenter server · vendor VMware vCenter Server

Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to bypass proxy leading to internal endpoints being accessed.

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/vcenter server6.7
  • vendor VMware vCenter Serverversion unspecified

How to fix CVE-2021-22017

What to do

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

Should you patch?

CVE-2021-22017 is in the CISA known-exploited catalog, due Jan 24, 2022. Confirm VMware vCenter Server against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with vmware/vcenter server 6.7. Apply updates per vendor instructions.

What should an analyst verify?

CWE-23. EPSS 49.18%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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. Sep 23, 2021 · Catalog

    Detected

    Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to bypass proxy leading to internal endpoints being accessed.

  2. Jan 10, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jan 24, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to bypass proxy leading to internal endpoints being accessed.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-22017

    Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-22017

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-22017

    30-day exploitation probability 49.2%

    first.org
  • NIST NVDVulnerability recordCVE-2021-22017

    Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to bypass proxy leading to internal endpoints being accessed.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-22017

    Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.