CVE-2021-22006

The vCenter Server contains a reverse proxy bypass vulnerability due to the way the endpoints handle the URI. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to access restricted endpoints.

Published: 2021-09-23 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-22006 is rated Moderate Risk (57.4/100): CVSS High severity, with high exploitation likelihood (EPSS 6.33%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-22006

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 57.31% 6.33% -50.97%
2 2026-03-04 44.50% 57.31% +12.81%
3 2026-03-01 — 44.50% —

Full EPSS history (57 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-22006

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-22006

Affected software / configurations for CVE-2021-22006

Vendor Product Version Raw CPE
vmware cloud_foundation >= 3.0, < 5.0 cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*
vmware vcenter_server 6.7 cpe:2.3:a:vmware:vcenter_server:6.7:-:*:*:*:*:*:*
vmware vcenter_server 7.0 cpe:2.3:a:vmware:vcenter_server:7.0:-:*:*:*:*:*:*

References for CVE-2021-22006

cvelogic Threat Intelligence