CVE-2021-33742

8.8

HIGH

Microsoft Windows MSHTML Platform Remote Code Exec - [Actively Exploited]

Description

Windows MSHTML Platform Remote Code Execution Vulnerability

INFO

Published Date :

June 8, 2021, 11:15 p.m.

Last Modified :

Nov. 21, 2024, 6:09 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

2.8

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Nov 17, 2021

Alert Date: Nov 03, 2021 | 1145 days ago

Description :

Microsoft Windows MSHTML Platform contains an unspecified vulnerability that allows for remote code execution.

Required Action :

Apply updates per vendor instructions.

Notes :

https://nvd.nist.gov/vuln/detail/CVE-2021-33742

Public PoC/Exploit Available at Github

CVE-2021-33742 has a 3 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-2021-33742 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
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_10_1607
10	Microsoft	windows_10_1809
11	Microsoft	windows_10_20h2
12	Microsoft	windows_10_1507
13	Microsoft	windows_10_21h1
14	Microsoft	windows_10_1909
15	Microsoft	windows_10_2004
16	Microsoft	windows_server_2012_r2
17	Microsoft	windows_server_2008_r2
18	Microsoft	windows_server_2008_sp2

: Total Affected Vendor : 1 | Products : 18

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-2021-33742.

URL	Resource
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742	Patch Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742	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).

Birdo1221/UserAG-Changer

A Browser Extension That Changes Your User-agent, From Desktop to Macintosh to IOS + Custom UA

brower browser-extension chrome-extension css extension html javascript side-project spoofer spoofing user-agent useragent

JavaScript HTML CSS

Updated: 5 months ago

0 stars 0 fork 0 watcher

Born at : July 17, 2024, 6:55 p.m. This repo has been linked 3 different CVEs too.

Ostorlab/KEV

Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

cisa-kev vulnerability 0day cisa exploits

Updated: 2 weeks, 2 days ago

548 stars 35 fork 35 watcher

Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1228 different CVEs too.

yogsma/beacon23

Beacon23 - A Vulnerability Finder

Java

Updated: 3 years, 5 months ago

0 stars 0 fork 0 watcher

Born at : June 9, 2021, 2:53 a.m. This repo has been linked 1 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-2021-33742 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-33742 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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742

Modified Analysis by [email protected]

Jul. 29, 2024

Action	Type	Old Value	New Value
Changed	CPE Configuration	OR cpe:2.3:o:microsoft:windows_10:-::::::: cpe:2.3:o:microsoft:windows_10:20h2::::::: cpe:2.3:o:microsoft:windows_10:21h1::::::: cpe:2.3:o:microsoft:windows_10:1607::::::: cpe:2.3:o:microsoft:windows_10:1809::::::: cpe:2.3:o:microsoft:windows_10:1909::::::: cpe:2.3:o:microsoft:windows_10:2004::::::: cpe:2.3:o:microsoft:windows_7:-:sp1::::::* cpe:2.3:o:microsoft:windows_8.1:-::::::: cpe:2.3:o:microsoft:windows_rt_8.1:-::::::: cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64: cpe:2.3:o:microsoft:windows_server_2008:sp2::::::: 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_2016:20h2::::::: cpe:2.3:o:microsoft:windows_server_2016:1909::::::: cpe:2.3:o:microsoft:windows_server_2016:2004::::::: cpe:2.3:o:microsoft:windows_server_2019:-:::::::	OR cpe:2.3:o:microsoft:windows_10_1507::::::::* versions up to (excluding) 10.0.10240.18967 cpe:2.3:o:microsoft:windows_10_1607::::::::* versions up to (excluding) 10.0.14393.4467 cpe:2.3:o:microsoft:windows_10_1809::::::::* versions up to (excluding) 10.0.17763.1999 cpe:2.3:o:microsoft:windows_10_1909::::::::* versions up to (excluding) 10.0.18363.1621 cpe:2.3:o:microsoft:windows_10_2004::::::::* versions up to (excluding) 10.0.19041.1052 cpe:2.3:o:microsoft:windows_10_20h2::::::::* versions up to (excluding) 10.0.19042.1052 cpe:2.3:o:microsoft:windows_10_21h1::::::::* versions up to (excluding) 10.0.19043.1052 cpe:2.3:o:microsoft:windows_7:-:sp1::::::* cpe:2.3:o:microsoft:windows_8.1:-::::::: cpe:2.3:o:microsoft:windows_rt_8.1:-::::::: cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64: cpe:2.3:o:microsoft:windows_server_2008:sp2::::::: 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::::::::* versions up to (excluding) 10.0.14393.4467 cpe:2.3:o:microsoft:windows_server_2019::::::::* versions up to (excluding) 10.0.17763.1999

CVE Modified by [email protected]

May. 14, 2024

Action	Type	Old Value	New Value

CVE Modified by [email protected]

Dec. 30, 2023

Action	Type	Old Value	New Value
Added	CVSS V3.1		Microsoft Corporation AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE Remap by [email protected]

Aug. 08, 2023

Action	Type	Old Value	New Value
Changed	CWE	CWE-681	CWE-119

CWE Remap by [email protected]

Jul. 12, 2022

Action	Type	Old Value	New Value
Changed	CWE	NVD-CWE-noinfo	CWE-681

Initial Analysis by [email protected]

Jun. 14, 2021

Action	Type	Old Value	New Value
Added	CVSS V2 Metadata		Victim must voluntarily interact with attack mechanism
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:R/S:U/C:H/I:H/A:H
Changed	Reference Type	https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742 No Types Assigned	https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742 Patch, Vendor Advisory
Added	CWE		NIST NVD-CWE-noinfo
Added	CPE Configuration		OR cpe:2.3:o:microsoft:windows_10:-::::::: cpe:2.3:o:microsoft:windows_10:20h2::::::: cpe:2.3:o:microsoft:windows_10:21h1::::::: cpe:2.3:o:microsoft:windows_10:1607::::::: cpe:2.3:o:microsoft:windows_10:1809::::::: cpe:2.3:o:microsoft:windows_10:1909::::::: cpe:2.3:o:microsoft:windows_10:2004::::::: cpe:2.3:o:microsoft:windows_7:-:sp1::::::* cpe:2.3:o:microsoft:windows_8.1:-::::::: cpe:2.3:o:microsoft:windows_rt_8.1:-::::::: cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64: cpe:2.3:o:microsoft:windows_server_2008:sp2::::::: 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_2016:20h2::::::: cpe:2.3:o:microsoft:windows_server_2016:1909::::::: cpe:2.3:o:microsoft:windows_server_2016:2004::::::: 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-2021-33742 is associated with the following CWEs:

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

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-2021-33742 weaknesses.

CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-42: MIME Conversion MIME Conversion CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-100: Overflow Buffers Overflow Buffers CAPEC-123: Buffer Manipulation Buffer Manipulation

CVE-2021-33742

Microsoft Windows MSHTML Platform Remote Code Exec - [Actively Exploited]

Description

INFO

June 8, 2021, 11:15 p.m.

Nov. 21, 2024, 6:09 a.m.

[email protected]

Yes !

5.9

2.8

CISA KEV (Known Exploited Vulnerabilities)

Public PoC/Exploit Available at Github

Affected Products

References to Advisories, Solutions, and Tools

Birdo1221/UserAG-Changer

Ostorlab/KEV

yogsma/beacon23

CVE Modified by af854a3a-2127-422b-91ae-364da2661108

Modified Analysis by [email protected]

CVE Modified by [email protected]

CVE Modified by [email protected]

CWE Remap by [email protected]

CWE Remap by [email protected]

Initial Analysis by [email protected]

CWE - Common Weakness Enumeration

Common Attack Pattern Enumeration and Classification (CAPEC)

Exploit Prediction

14.25 }} -15.72%

0.95690

CVSS31 - Vulnerability Scoring System

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