Unpatched vulnerabilities refer to weaknesses that allow attackers to leverage a known security bug that has not been patched by running malicious code. In 2021, 65 new vulnerabilities arose that were connected to ransomware. This was observed to be a twenty-nine percent growth compared to the number of vulnerabilities in 2020. Software vendors write additions to the codes, known as “patches,” when they come to know about these application vulnerabilities to secure these weaknesses. The top three most severe vulnerabilities recorded in 2021 are: Out-of-bounds Write, Cross-site Scripting, Out-Of-Bounds Read, and Cross-Site Scripting.”]
Source: https://thehackernews.com/2022/03/the-continuing-threat-of-unpatched.html