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.
Cybersecurity researchers have shed light on a previously undocumented threat actor called NightEagle (aka APT-Q-95) that has been observed targeting Microsoft Exchange servers as a part of a zero-day exploit chain designed to target government, defense, and technology sectors in China
The French cybersecurity agency on Tuesday revealed that a number of entities spanning governmental, telecommunications, media, finance, and transport sectors in the country were impacted by a malicious campaign undertaken by a Chinese hacking group by weaponizing several zero-day vulnerabilities in Ivanti Cloud Services Appliance (CSA) devices
Analyzing binary code helps vendors and organizations detect security threats and zero-day vulnerabilities in the software supply chain, but it doesn't come without challenges. It looks like AI has come to the rescue.
The French cybersecurity agency identified Houken, a new Chinese intrusion campaign targeting various industries in France
Google has patched a critical type confusion vulnerability in Chrome, the fourth zero-day fix in 2025
Separate threats to popular browsers highlight the growing security risk for enterprises presented by the original gateway to the Web, which remains an integral tool for corporate users.
Google has released emergency updates to patch another Chrome zero-day vulnerability exploited in attacks, marking the fourth such flaw fixed since the start of the year. [...]
Google has released security updates to address a vulnerability in its Chrome browser for which an exploit exists in the wild
Ever wonder what happens when attackers don’t break the rules—they just follow them better than we do? When systems work exactly as they’re built to, but that “by design” behavior quietly opens the door to risk? This week brings stories that make you stop and rethink what’s truly under control. It’s not always about a broken firewall or missed patch—it’s about the small choices, default settings