Security News > 2021 > November > Microsoft Nov. Patch Tuesday Fixes Six Zero-Days, 55 Bugs

Microsoft reported a total of 55 vulnerabilities, six of which are rated critical, with the remaining 49 being rated important.

Still, as always, this Patch Tuesday delivers high-priority fixes, the most urgent of which being the duo that are under attack.

This patch fixes a security feature bypass vulnerability ​​in Microsoft Excel for both Windows and MacOS computers that could allow code execution when opening a specially crafted file.

"While Microsoft only rates the vulnerability as 'Important' because an attacker has to be authenticated to exploit it, Recorded Future has noted that gaining legitimate credential access to Windows systems has become trivial for both nation state and cybercriminal actors," Liska said via email.

Microsoft wasn't clear about which security feature is bypassed by this security feature bypass vulnerability for Microsoft Excel for both Windows and MacOS computers, which affects versions 2013 - 2021.

Microsoft Excel is a frequent target of both nation-state attackers and cybercriminals, he noted.

News URL

https://threatpost.com/microsoft-nov-patch-tuesday-fixes-six-zero-days-55-bugs/176143/