A 0-Day is a software vulnerability without an available fix, creating risk because defenders have limited time to mitigate exploitation.
Search across headline titles and summaries.
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.
Cisco advises owners of end-of-life Small Business RV routers to upgrade to newer models after disclosing a remote code execution vulnerability that will not be patched. [...]
Chinese hackers used a zero-day exploit for a critical-severity vulnerability in Sophos Firewall to compromise a company and breach cloud-hosted web servers operated by the victim. [...]
Microsoft has released security updates with the June 2022 cumulative Windows Updates to address a critical Windows zero-day vulnerability known as Follina and actively exploited in ongoing attacks. [...]
Today is Microsoft's June 2022 Patch Tuesday, and with it comes fixes for 55 vulnerabilities, including fixes for the Windows MSDT 'Follina' zero-day vulnerability and new Intel MMIO flaws. [...]