Nollapäivähaavoittuvuus

Nollapäivähaavoittuvuus, often referred to as a zero-day vulnerability, is a security flaw in software or hardware that is unknown to the vendor or developer. This means that there is no patch or fix available for it, making systems that use the affected component particularly vulnerable. The term "zero-day" refers to the fact that the developers have had zero days to address the issue once it becomes publicly known or exploited.

These vulnerabilities can be discovered by security researchers, malicious actors, or even by accident. When a zero-day is found by attackers, they can exploit it to gain unauthorized access to systems, steal data, install malware, or disrupt services. Because there is no immediate defense, these attacks can be highly effective and difficult to detect.

The lifecycle of a zero-day vulnerability typically involves discovery, exploitation, and then eventual discovery by the vendor, followed by the development and release of a patch. Until that patch is applied by users, the vulnerability remains a significant risk. Organizations and individuals often rely on security measures like intrusion detection systems and behavioral analysis to try and identify and mitigate zero-day attacks in the absence of specific patches. The sale and use of zero-day exploits by governments or private entities for intelligence gathering or cyber warfare is a contentious issue within the cybersecurity community.