CVE-2021-22017
VMware vCenter Server Improper Access Control
- Published
- Sep 23, 2021
- Updated
- Oct 21, 2025
- Assigning CNA
- vmware
- Evidence observed
- Jan 10, 2022
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NModerate · next 30 days
- Percentile
- 98.9%
- Model date
- Oct 13, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
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.
Sources
http/cves/2021/CVE-2021-22017.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: dsl,status,word($.matchers[*].type)
Responsible use
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