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.
Candiru attackers breached a news agency employee website to target journalists with DevilsTongue spyware, researchers say.
The actively exploited but now-fixed Google Chrome zero-day flaw that came to light earlier this month was weaponized by an Israeli spyware company and used in attacks targeting journalists in the Middle East
The Israeli spyware vendor Candiru was found using a zero-day vulnerability in Google Chrome to spy on journalists and other high-interest individuals in the Middle East with the 'DevilsTongue' spyware. [...]
One vendor's zero-day is another vendor's routine patch...