CVE-2021-22049Network attack vector

Unauthenticated SSRF via Web Client request handling

Published Nov 24, 2021 · Updated Aug 3, 2024

SSRF in VMware vCenter Server 6.5 and 6.7 allows remote attackers to access arbitrary URLs through the vSAN UI plug-in on port 443. The legacy FLEX/Flash plug-in permits an untrusted request to direct vCenter Server to an external URL or internal service; VMware has not disclosed the responsible endpoint or validation failure. Network access to port 443 is sufficient, and Cloud Foundation 3.x is also exposed through its deployed vCenter Server component.

CVSS severity6.5
Medium
EPSS probability1.67%
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

SSRF in VMware vCenter Server 6.5 and 6.7 allows remote attackers to access arbitrary URLs through the vSAN UI plug-in on port 443. The legacy FLEX/Flash plug-in permits an untrusted request to direct vCenter Server to an external URL or internal service; VMware has not disclosed the responsible endpoint or validation failure. Network access to port 443 is sufficient, and Cloud Foundation 3.x is also exposed through its deployed vCenter Server component.

The record

CVE
CVE-2021-22049
Published
Nov 24, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5VMwareCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

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