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On September 7th, 2021, Microsoft announced a new critical zero-day vulnerability impacting Windows devices. The vulnerability, tracked as CVE-2021-40444 (CVSS: 8.8), is an unauthenticated Remote Code Execution vulnerability. In an attack scenario, an adversary would send a maliciously crafted document to the potential victim; if the document is opened, code execution is achieved.
Microsoft has confirmed that targeted exploitation is ongoing. It is recommended that organizations apply the mitigations provided by Microsoft until security patches are released.
External security researchers have identified potential bypasses to the mitigations provided by Microsoft. As such, it is highly recommended that organizations apply the relevant security patches once released. Microsoft has not stated when security patches will be made available. Microsoft claims that both Microsoft Defender Antivirus and Defender for Endpoint are able to detect the exploitation of this vulnerability. It should be noted that user interaction is required for successful exploitation of the vulnerability. As such, users should be informed of the risks of opening unexpected documents and emails.
CVE-2021-40444 is a vulnerability found in MSHTML, the file that allows Microsoft Internet Explorer to read and display HTML webpages.
At this point, attacks exploiting CVE-2021-40444 are believed to be targeted in nature, likely by a single threat actor group. The publication of vulnerability details is likely to lead to wider exploitation in the immediate future.