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.
CERT-FR's advisory follows last month's disclosure of a zero-day flaw Apple said was used in "sophisticated" attacks against targeted individuals.
A similar vuln on Apple devices was used against 'specific targeted users' Samsung has fixed a critical flaw that affects its Android devices - but not before attackers found and exploited the bug, which could allow remote code execution on affected devices.…
Samsung has released its monthly security updates for Android, including a fix for a security vulnerability that it said has been exploited in zero-day attacks
Samsung has patched a remote code execution vulnerability that was exploited in zero-day attacks targeting its Android devices. [...]
Patch, turn on MFA, and restrict access to trusted networks…or else Affiliates of the Akira ransomware gang are again exploiting a critical SonicWall vulnerability abused last summer, after a suspected zero-day flaw actually turned out to be related to a year-old bug.…
Scattered Spider didn't need a zero-day to breach Clorox. They just phoned the help desk—convincing agents to reset passwords & MFA without proper checks. The result: $380M in damages. Learn from Specops Software why caller verification and audit trails are critical. [...]
Microsoft on Tuesday addressed a set of 80 security flaws in its software, including one vulnerability that has been disclosed as publicly known at the time of release
Microsoft Corp. today issued security updates to fix more than 80 vulnerabilities in its Windows operating systems and software. There are no known "zero-day" or actively exploited vulnerabilities in this month's bundle from Redmond, which nevertheless includes patches for 13 flaws that earned Microsoft's most-dire "critical" label. Meanwhile, both Apple and Google recently released updates to fix zero-day bugs in their devices.
Today is Microsoft's September 2025 Patch Tuesday, which includes security updates for 81 flaws, including two publicly disclosed zero-day vulnerabilities. [...]