Microsoft recently patched a zero-day vulnerability under active exploit in Microsoft Outlook, identified as CVE-2023-23397, which could enable an attacker to perform a privilege escalation, accessing the victim's Net-NTLMv2 challenge-response authentication hash and impersonating the user.Now it's becoming clear that CVE-2023-23397 is dangerous enough to become the most far-reaching bug of the year, security researchers are warning.