#VU53915 Code Injection in Windows Defender - CVE-2021-31985

Vulnerability identifier: #VU53915

Vulnerability risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-31985

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows Defender
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in Microsoft Defender. A remote attacker can execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows Defender: All versions

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31985

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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?

No. We are not aware of malware exploiting this vulnerability.