CVE-2021-22017

5.3 mediumKEVEPSS 49%

Medium (5.3) in VMware vCenter Server. In CISA KEV since 2022-01-10. EPSS 49% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.3 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 49% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
CISA KEV: listed 2022-01-10, due 2022-01-24
Published: 2021-09-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

vmware:vcenter_server

References

https://www.vmware.com/security/advisories/VMSA-2021-0020.html
https://www.vmware.com/security/advisories/VMSA-2021-0020.html
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22017

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