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.
Details have emerged about a China-nexus threat group's exploitation of a recently disclosed, now-patched security flaw in Cisco switches as a zero-day to seize control of the appliances and evade detection
Today, Google released a new Chrome emergency security update to patch a zero-day vulnerability, the ninth one tagged as exploited this year. [...]
Today, Google released a new Chrome emergency security update to patch a zero-day vulnerability, the ninth one exploited in attacks this year. [...]
Lazarus Espionage Group's Sophisticated Malware Evades Antivirus MonitoringNorth Korea's Lazarus hacking team, which focuses on cryptocurrency theft and espionage, has once again been exploiting a zero-day vulnerability in Microsoft Windows to install antivirus-suppressing malware dubbed Fudmodule to aid its intrusions.
The notorious North Korean Lazarus hacking group exploited a zero-day flaw in the Windows AFD.sys driver to elevate privileges and install the FUDModule rootkit on targeted systems. [...]
A newly patched security flaw in Microsoft Windows was exploited as a zero-day by Lazarus Group, a prolific state-sponsored actor affiliated with North Korea