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.
Microsoft has disclosed an unpatched zero-day in Office that, if successfully exploited, could result in unauthorized disclosure of sensitive information to malicious actors
Microsoft has disclosed a high-severity zero-day vulnerability affecting Office 2016 and later, which is still waiting for a patch. [...]
The SEC concludes its investigation into Progress Software's handling of the widespread exploitation of a MOVEit Transfer zero-day flaw that exposed data of over 95 million people. [...]
A new zero-day pre-authentication remote code execution vulnerability has been disclosed in the Apache OFBiz open-source enterprise resource planning (ERP) system that could allow threat actors to achieve remote code execution on affected instances
Android security updates this month patch 46 vulnerabilities, including a high-severity remote code execution (RCE) exploited in targeted attacks. [...]