After Microsoft assigned an "important" rating to a zero-day vulnerability being exploited in the wild as part of this month's Patch Tuesday, security experts are urging security teams to prioritize updates based on risk rather than vendor severity ratings.

Microsoft reported just 56 vulnerabilities this month, nine critical and six already publicly disclosed.

But it is the zero-day, CVE-2021-1732, or rather it's rating, that drew attention. To exploit this Windows Win32k.sys elevation of privilege vulnerability that impacts Windows 10 and Windows Server 2019, Allan Liska, senior security architect at Recorded Future, said, an attacker would have to have access to the target system then gain administrative access.

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