CVE DATABASE / CVE-2021-22017
CVE-2021-22017
VMware vCenter Server Improper Access Control
CVSS 5.3 · MEDIUM
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2022-01-10.
Federal remediation due 2022-01-24.
Required action: Apply updates per vendor instructions.
Summary
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.
CVSS 3.1 breakdown
| Base score | 5.3 (MEDIUM) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity | NONE |
| Availability | NONE |
Affected products
Vmware vcenter server
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References
- https://www.vmware.com/security/advisories/VMSA-2021-0020.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22017
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-30. Always verify against the vendor advisory before acting.