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CVE-2021-22017

Medium CVSS 5.3 Known exploited

Published 2021-09-23 · last changed 2026-06-17 · added to CISA KEV 2022-01-10

This one is being exploited in the wild.

CISA added CVE-2021-22017 to the Known Exploited Vulnerabilities catalog on 2022-01-10. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2021-22017, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

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

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