VMware vCenter Server < 6.5 U3q Multiple Vulnerabilities (VMSA-2021-0020)

high Nessus Plugin ID 153547


A virtualization management application installed on the remote host is affected by multiple vulnerabilities.


The version of VMware vCenter Server installed on the remote host is 6.5 prior to 6.5 U3q. It is, therefore, affected by multiple vulnerabilities:

- A privilege escalation vulnerability exists in vCenter Server due to the way it handles session tokens. An authenticated, local attacker can exploit this to gain unauthorized access to the system. (CVE-2021-21991, CVE-2021-22015)

- An rhttproxy bypass vulnerability exists in vCenter Server due to improper implementation of URI normalization. An unauthenticated, remote attacker can exploit this to gain access to internal endpoints. (CVE-2021-22017)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number. Nessus has also not tested for the presence of a workaround.


Upgrade to VMware vCenter Server 6.5 U3q or later or apply the workaround mentioned in the advisory.

See Also


Plugin Details

Severity: High

ID: 153547

File Name: vmware_vcenter_65_u3q_vmsa-2021-0020.nasl

Version: 1.9

Type: remote

Family: Misc.

Published: 9/22/2021

Updated: 12/13/2022

Risk Information


Risk Factor: High

Score: 8.4


Risk Factor: High

Base Score: 9

Temporal Score: 7.8

Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C

Temporal Vector: E:H/RL:OF/RC:C

CVSS Score Source: CVE-2021-22014


Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:H/RL:O/RC:C

CVSS Score Source: CVE-2021-22015

Vulnerability Information

CPE: cpe:/a:vmware:vcenter_server

Required KB Items: Host/VMware/vCenter, Host/VMware/version, Host/VMware/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/21/2021

Vulnerability Publication Date: 9/21/2021

CISA Known Exploited Dates: 1/24/2022

Exploitable With

Metasploit (VMware vCenter vScalation Priv Esc)

Reference Information

CVE: CVE-2021-21991, CVE-2021-21992, CVE-2021-21993, CVE-2021-22008, CVE-2021-22009, CVE-2021-22011, CVE-2021-22012, CVE-2021-22013, CVE-2021-22014, CVE-2021-22015, CVE-2021-22017, CVE-2021-22019

IAVA: 2021-A-0434