7.5
HIGH
CVE-2021-43893
Windows EFS Escalation
Description

Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability

INFO

Published Date :

Dec. 15, 2021, 3:15 p.m.

Last Modified :

Nov. 21, 2024, 6:29 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

1.6
Public PoC/Exploit Available at Github

CVE-2021-43893 has a 10 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-43893 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft windows_10
2 Microsoft windows_7
3 Microsoft windows_8.1
4 Microsoft windows_rt_8.1
5 Microsoft windows_server_2008
6 Microsoft windows_server_2012
7 Microsoft windows_server_2016
8 Microsoft windows_server_2019
9 Microsoft windows_server
10 Microsoft windows_10_1607
11 Microsoft windows_10_1809
12 Microsoft windows_10_20h2
13 Microsoft windows_10_21h2
14 Microsoft windows_server_2022
15 Microsoft windows_11_21h2
16 Microsoft windows_11
17 Microsoft windows_10_1507
18 Microsoft windows_10_21h1
19 Microsoft windows_10_1909
20 Microsoft windows_server_20h2
21 Microsoft windows_server_2004
22 Microsoft windows_server_2012_r2
23 Microsoft windows_server_2008_r2
24 Microsoft windows_server_2008_sp2
: Total Affected Vendor : 1 | Products : 24
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-2021-43893.

URL Resource
http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.html Third Party Advisory VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893 Patch Vendor Advisory
http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.html Third Party Advisory VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893 Patch 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).

Profile Photo
Cruxer8Mech/Idk

None

Updated: 6 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : May 26, 2024, 1:37 p.m. This repo has been linked 233 different CVEs too.
Profile Photo
NaInSec/CVE-PoC-in-GitHub

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 1 month, 2 weeks ago
8 stars 3 fork 3 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 928 different CVEs too.
Profile Photo
zecool/cve

None

Updated: 9 months, 1 week ago
1 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
michealadams30/Cve-2022-26809

None

Python

Updated: 1 year, 11 months ago
0 stars 1 fork 1 watcher
Born at : Dec. 26, 2022, 10:36 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
WhooAmii/POC_to_review

None

Updated: 10 months ago
2 stars 2 fork 2 watcher
Born at : Nov. 25, 2022, 5:43 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
anquanscan/sec-tools

None

Updated: 2 weeks, 6 days ago
25 stars 5 fork 5 watcher
Born at : July 28, 2022, 3:22 a.m. This repo has been linked 149 different CVEs too.
Profile Photo
soosmile/POC

None

Updated: 5 months, 3 weeks ago
8 stars 1 fork 1 watcher
Born at : June 21, 2022, 7:45 a.m. This repo has been linked 943 different CVEs too.
Profile Photo
yuanLink/CVE-2022-26809

None

cve-2022-26809

C Makefile Python

Updated: 2 months ago
59 stars 26 fork 26 watcher
Born at : May 1, 2022, 1:19 p.m. This repo has been linked 2 different CVEs too.
Profile Photo
jbaines-r7/blankspace

Proof of Concept for EFSRPC Arbitrary File Upload (CVE-2021-43893)

windows exploit poc cve-2021-43893

C C++

Updated: 2 weeks, 1 day ago
62 stars 13 fork 13 watcher
Born at : Feb. 4, 2022, 5:11 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
ycdxsb/WindowsPrivilegeEscalation

Collection of Windows Privilege Escalation (Analyse/PoC/Exploit)

Updated: 2 weeks, 2 days ago
328 stars 62 fork 62 watcher
Born at : April 22, 2021, 3:29 a.m. This repo has been linked 276 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-43893 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-43893 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 http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.html
    Added Reference https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CWE Remap by [email protected]

    Jul. 12, 2022

    Action Type Old Value New Value
    Changed CWE CWE-269 CWE-668
  • CPE Deprecation Remap by [email protected]

    May. 23, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:microsoft:windows_server:2004:*:*:*:*:*:*:* OR *cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    May. 23, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:microsoft:windows_server:20h2:*:*:*:*:*:*:* OR *cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*
  • Modified Analysis by [email protected]

    Apr. 04, 2022

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.html No Types Assigned http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.html Third Party Advisory, VDB Entry
  • CVE Modified by [email protected]

    Jan. 13, 2022

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.html [No Types Assigned]
  • Modified Analysis by [email protected]

    Jan. 01, 2022

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Dec. 29, 2021

    Action Type Old Value New Value
    Added CVSS V3.1 Microsoft Corporation AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  • Initial Analysis by [email protected]

    Dec. 23, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893 No Types Assigned https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893 Patch, Vendor Advisory
    Added CWE NIST CWE-269
    Added CPE Configuration OR *cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:arm64:* *cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:arm64:* *cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_10:21h2:*:*:*:*:*:arm64:* *cpe:2.3:o:microsoft:windows_10:21h2:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:21h2:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:arm64:* *cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:arm64:* *cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:arm64:* *cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:arm64:* *cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server:20h2:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server:2004:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server:2022:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_server_2008:r2:sp2:*:*:*:*:x64:* *cpe:2.3:o:microsoft:windows_server_2008:r2:sp2:*:*:*:*:x86:* *cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
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-2021-43893 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-2021-43893 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.40 }} 0.27%

score

0.73138

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: