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A proof-of-concept for this vulnerability was released last weekend and could be a sign of upcoming malware campaigns. The vulnerability CVE-2023-21716 is of low complexity and could be exploited by sending an email with a rich text format (RTF) payload that, when opened or viewed in Outlook’s “Preview Pane”, leads to command execution. As such, we are issuing this advisory to call this to your attention and asking you to update your devices now. In February, Microsoft released a patch for a critical vulnerability in Word, SharePoint, Office 365, and Office for Mac that could allow remote code execution.

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