CVE-2021-22017
KEVVMware vCenter Server Improper Access Control
Description
Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NPublishedSep 23, 2021
Last modifiedJun 17, 2026
Added to KEVJan 10, 2022
Remediation dueJan 24, 2022
References
- vmware.com/security/advisories/VMSA-2021-0020.htmlPatchVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22017US Government Resource
0 recent articles mention this CVE
61
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1737 days
- CVSS
- 5.3 MEDIUM
- EPSS (30-day exploit probability)
- 49.2% · top 1% of all CVEs
- Weakness
- NVD-CWE-noinfo
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.