A 0-Day is a software vulnerability without an available fix, creating risk because defenders have limited time to mitigate exploitation.
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Background for this topic.
0-Day describes a software vulnerability unknown to the software maker or unpatched when first exploited. Attackers can use these flaws immediately, as no official fix or signature exists to block the exploit. Such vulnerabilities often affect widely deployed software or hardware, making them valuable for targeted attacks or widespread campaigns.
Because defenders lack patches or reliable detection signatures initially, they must rely on anomaly detection, network monitoring, and threat intelligence to identify suspicious activity linked to 0-day exploits. Rapid patching once a fix is released is critical to reduce exposure. Tracking emerging 0-day threats helps prioritize defensive measures and informs risk management decisions in environments where unpatched vulnerabilities pose significant security risks.
Google has released Chrome 105.0.5195.102 for Windows, Mac, and Linux users to address a high-severity zero-day security flaw exploited by attackers in attacks, the sixth Chrome zero-day patched this year. [...]
Apple has released new security updates to backport patches released earlier this month to older iPhones and iPads addressing a remotely exploitable WebKit zero-day that allows attackers to execute arbitrary code on unpatched devices. [...]