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 confirmed that two recently reported zero-day vulnerabilities in Microsoft Exchange Server 2013, 2016, and 2019 are being exploited in the wild. [...]
Threat actors are exploiting yet-to-be-disclosed Microsoft Exchange zero-day bugs allowing for remote code execution, according to claims made by security researchers at Vietnamese cybersecurity outfit GTSC, who first spotted and reported the attacks. [...]
Threat actors are exploiting yet-to-be-disclosed Microsoft Exchange zero-day bugs allowing for remote code execution, according to claims made by security researchers at Vietnamese cybersecurity outfit GTSC, who first spotted and reported the attacks. [...]
Threat actors are exploiting yet-to-be-disclosed Microsoft Exchange zero-day bugs allowing for remote code execution, according to claims made by security researchers at Vietnamese cybersecurity outfit GTSC, who first spotted and reported the attacks. [...]