9.8
CRITICAL
CVE-2021-21994
ESXi SFCB Authentication Bypass
Description
SFCB (Small Footprint CIM Broker) as used in ESXi has an authentication bypass vulnerability. A malicious actor with network access to port 5989 on ESXi may exploit this issue to bypass SFCB authentication by sending a specially crafted request.
INFO
Published Date :
July 13, 2021, 7:15 p.m.
Last Modified :
Nov. 21, 2024, 5:49 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-21994.
| URL | Resource |
|---|---|
| https://www.vmware.com/security/advisories/VMSA-2021-0014.html | Vendor Advisory |
| https://www.vmware.com/security/advisories/VMSA-2021-0014.html | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21994 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21994 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://www.vmware.com/security/advisories/VMSA-2021-0014.html -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Jun. 02, 2022
Action Type Old Value New Value Removed CPE Configuration OR *cpe:2.3:o:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (excluding) 3.10.2 *cpe:2.3:o:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (including) 4.1.0.1 *cpe:2.3:o:vmware:esxi:*:*:*:*:*:*:*:* versions from (including) 6.5 up to (excluding) 7.0 *cpe:2.3:o:vmware:esxi:7.0:beta:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1a:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1b:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0.0:-:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0.0:1.20.16321839:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (excluding) 3.10.2 *cpe:2.3:o:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (excluding) 4.3 Added CPE Configuration OR *cpe:2.3:o:vmware:esxi:6.5:-:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201701001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201703001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201703002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201704001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707101:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707102:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707103:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707201:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707202:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707203:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707204:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707205:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707206:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707207:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707208:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707209:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707210:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707211:*:*:*:*:*:* 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*cpe:2.3:o:vmware:esxi:6.5:650-201912401:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912402:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912403:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912404:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202005001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202006001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202007001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202010001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202011001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202011002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202102001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202102002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202102003:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:-:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201806001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201807001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201808001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810101:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810102:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810103:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810201:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810202:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810203:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810204:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810205:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810206:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810207:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810208:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810209:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810210:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810211:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810212:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810213:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810214:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810215:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810216:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810217:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810218:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810219:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810220:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810221:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810222:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810223:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810224:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810225:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810226:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810227:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810228:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810229:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810230:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810231:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810232:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810233:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810234:*:*:*:*:*:* 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*cpe:2.3:o:vmware:esxi:6.7:670-201908202:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908203:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908204:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908205:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908206:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908207:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908208:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908209:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908210:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908211:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908212:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908213:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908214:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908215:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908216:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908217:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908218:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908219:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908220:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201908221:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201911001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912101:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912102:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912401:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912402:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912403:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912404:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201912405:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004301:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004401:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004402:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004403:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004404:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004405:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004406:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004407:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202004408:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202006001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202008001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202010001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202011001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202011002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202102001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-202103001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:-:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:beta:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1a:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1b:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1c:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1d:*:*:*:*:*:* -
Initial Analysis by [email protected]
Jul. 16, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://www.vmware.com/security/advisories/VMSA-2021-0014.html No Types Assigned https://www.vmware.com/security/advisories/VMSA-2021-0014.html Vendor Advisory Added CWE NIST CWE-287 Added CPE Configuration OR *cpe:2.3:o:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (excluding) 3.10.2 *cpe:2.3:o:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (including) 4.1.0.1 *cpe:2.3:o:vmware:esxi:*:*:*:*:*:*:*:* versions from (including) 6.5 up to (excluding) 7.0 *cpe:2.3:o:vmware:esxi:7.0:beta:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1a:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0:update_1b:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0.0:-:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:7.0.0:1.20.16321839:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21994 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-21994
weaknesses.
CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client
CAPEC-57: Utilizing REST's Trust in the System Resource to Obtain Sensitive Data Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
CAPEC-94: Adversary in the Middle (AiTM) Adversary in the Middle (AiTM)
CAPEC-114: Authentication Abuse Authentication Abuse
CAPEC-115: Authentication Bypass Authentication Bypass
CAPEC-151: Identity Spoofing Identity Spoofing
CAPEC-194: Fake the Source of Data Fake the Source of Data
CAPEC-593: Session Hijacking Session Hijacking
CAPEC-633: Token Impersonation Token Impersonation
CAPEC-650: Upload a Web Shell to a Web Server Upload a Web Shell to a Web Server
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.49 }} 0.14%
score
0.75844
percentile
CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability