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.
Cox Enterprises is notifying impacted individuals of a data breach that exposed their personal data to hackers who breached the company network after exploiting a zero-day flaw in Oracle E-Business Suite. [...]
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added a critical security flaw impacting Oracle Identity Manager to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation
The U.S. Cybersecurity & Infrastructure Security Agency (CISA) is warning government agencies to patch an Oracle Identity Manager tracked as CVE-2025-61757 that has been exploited in attacks, potentially as a zero-day. [...]
Attackers may be joining the dots to enable unauthenticated RCE Fortinet has confirmed that another flaw in its FortiWeb web application firewall has been exploited as a zero-day and issued a patch, just days after disclosing a critical bug in the same product that attackers had found and abused a month earlier.…
A second zero-day vulnerability in its web application firewall (WAF) line has come under attack, raising more questions about the vendor's disclosure practices.
CISA has ordered U.S. government agencies to secure their systems within a week against another vulnerability in Fortinet's FortiWeb web application firewall, which was exploited in zero-day attacks. [...]
Today, Fortinet released security updates to patch a new FortiWeb zero-day vulnerability that threat actors are actively exploiting in attacks. [...]
Seventh Chrome 0-day this year Google pushed an emergency patch on Monday for a high-severity Chrome bug that attackers have already found and exploited in the wild.…
Google has released an emergency security update to fix the seventh Chrome zero-day vulnerability exploited in attacks this year. [...]
Google on Monday released security updates for its Chrome browser to address two security flaws, including one that has come under active exploitation in the wild
Readiness metrics have flatlined since 2023, with most sectors slipping backward as teams fumble crisis drills Teams that think they're ready for a major cyber incident are scoring barely 22 percent accuracy and taking more than a day to contain simulated attacks, according to new data out Monday.…
PLUS: CISA still sitting on telecoms security report; DoorDash phished again; Lumma stealer returns; and more INFOSEC IN BRIEF The US Senate passed a resolution in July to force the US Cybersecurity and Infrastructure Security Agency (CISA) to publish a 2022 report into poor security in the telecommunications industry but the agency has not delivered the document.…
Microsoft this week pushed security updates to fix more than 60 vulnerabilities in its Windows operating systems and supported software, including at least one zero-day bug that is already being exploited. Microsoft also fixed a glitch that prevented some Windows 10 users from taking advantage of an extra year of security updates, which is nice because the zero-day flaw and other critical weaknesses patched today affect all versions of Windows, including Windows 10.