Latest zero-days Total: 529, in 2021: Zero-days 56, candidates: 0

Multiple vulnerabilities in Google Chrome
CVE-2021-30563

SQL injection in WooCommerce and WooCommerce Blocks plugin

The vulnerability was used to compromise WooCommerce plugin.

Privilege escalation in Microsoft Windows kernel
CVE-2021-31979

Remote code execution in Microsoft Scripting Engine
CVE-2021-34448

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.