CVE-2021-26411

A memory corruption vulnerability in unsupported Microsoft Internet Explorer allowed exploitation and was actively exploited in the wild, linked to ransomware activity.

CVE-2021-26411 represents a critical memory corruption vulnerability in Microsoft Internet Explorer, a discontinued and unsupported browser. This vulnerability was actively exploited, with links to ransomware, posing a significant risk to DIB organizations still using the browser. Organizations must immediately eliminate Internet Explorer from their environments to mitigate this exposure and maintain CMMC compliance.

Shame score — The vulnerability's exploitation in the wild, coupled with Internet Explorer's end-of-life status and history of security issues, demonstrates a significant failure in risk management and vendor support.