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.
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Hackers have targeted TrueConf conference servers in attacks that exploit a zero-day vulnerability, allowing them to execute arbitrary files on all connected endpoints. [...]
Google on Thursday released security updates for its Chrome web browser to address 21 vulnerabilities, including a zero-day flaw that it said has been exploited in the wild
Google has fixed the fourth Chrome vulnerability exploited in zero-day attacks since the start of the year. [...]
A high-severity security flaw in the TrueConf client video conferencing software has been exploited in the wild as a zero-day as part of a campaign targeting government entities in Southeast Asia dubbed TrueChaos