Remote code execution in Microsoft MSHTML
| Risk | Critical |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-40444 |
| CWE-ID | CWE-94 |
| Exploitation vector | Network |
| Public exploit | This vulnerability is being exploited in the wild. |
| Vulnerable software Subscribe |
Windows Operating systems & Components / Operating system Windows Server Operating systems & Components / Operating system Microsoft Internet Explorer Client/Desktop applications / Web browsers |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 1 vulnerabilities.
Updated: 14.09.2021
Changed bulletin status to patched.
1) Code Injection
EUVDB-ID: #VU56377
Risk: Critical
CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]
CVE-ID: CVE-2021-40444
CWE-ID:
CWE-94 - Improper Control of Generation of Code ('Code Injection')
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation within the MSHTML component. A remote attacker can create a specially crafted Office document with a malicious ActiveX control inside, trick the victim into opening the document and execute arbitrary code on the system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note, the vulnerability is being actively exploited in the wild.
Install update from vendor's website.
Vulnerable software versionsWindows: 8.1 - 10 S
Windows Server: 2008 - 2019 2004
Microsoft Internet Explorer: 11
CPE2.3- cpe:2.3:o:microsoft:windows:10 1809:10.0.17763.1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1909:10.0.18363.476:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 2004:10.0.19041.264:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 20H2:10.0.19042.572:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:8.1 RT:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 21H1:10.0.19043.985:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10:S:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1507:10.0.10240.16405:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10:Mobile:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1903:10.0.18362.116:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1803:10.0.17134.48:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1709:10.0.16299.19:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1703:10.0.15063.138:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10 1511:10.0.10586.3:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10:Gold:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019 2004:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019 20H2:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:microsoft_internet_explorer:11:*:*:*:*:*:*:*
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40444
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
