In the 100 most prevalent unpatched vulnerabilities, the majority (93 out of the 100) are found in software by Adobe, Zoom, and Mozilla.
No vulnerability listed as critical made it into the top 100 most prevalent vulnerabilities. But one critical vulnerability was close: CVE-2020-9633 in Adobe Flash Player. The vulnerable version of Flash is still in use because Adobe silently introduced a time bomb in later Flash Player versions that would prevent Flash Player from working and playing any Flash content after January 12, 2021. So organizations that have certain Flash content they need to play often to go back to that vulnerable version.
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Source: Malwarebytes Labs