CVE-2021-22011Network attack vector

Unauthenticated VM network setting manipulation

Published Sep 23, 2021 · Updated Aug 3, 2024

Unauthenticated API access in VMware vCenter Server Content Library allows remote attackers to manipulate VM network settings over port 443. VMware has not disclosed the endpoint, handler, or missing authorization operation that lets untrusted API requests change those settings. Network reachability to the vCenter HTTPS service is sufficient; the documented consequence is unauthorized VM network reconfiguration, not guest code execution.

CVSS severity8.1
High
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unauthenticated API access in VMware vCenter Server Content Library allows remote attackers to manipulate VM network settings over port 443. VMware has not disclosed the endpoint, handler, or missing authorization operation that lets untrusted API requests change those settings. Network reachability to the vCenter HTTPS service is sufficient; the documented consequence is unauthorized VM network reconfiguration, not guest code execution.

The record

CVE
CVE-2021-22011
Published
Sep 23, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
8.1VMwareCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H
5.0NVDAV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo