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CVE-2021-22017

5.3 · MEDIUMActively Exploited

Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.

Published Sep 23, 2021EPSS 49.18%

Overview

CVE-2021-22017 is a medium-severity vulnerability. It was published on September 23, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.vmware.com/security/advisories/VMSA-2021-0020.htmlRefwww.vmware.com/security/advisories/VMSA-2021-0020.htmlCISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22017

How CyberStrike helps

Frequently asked questions

What is CVE-2021-22017?

CVE-2021-22017 is a medium-severity vulnerability. It was published on September 23, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2021-22017?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-22017?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-22017?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-22017 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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