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.
An advanced China-nexus cyber espionage group previously linked to the exploitation of security flaws in VMware and Fortinet appliances has been linked to the abuse of a critical vulnerability in VMware vCenter Server as a zero-day since late 2021
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday issued an emergency directive urging Federal Civilian Executive Branch (FCEB) agencies to implement mitigations against two actively exploited zero-day flaws in Ivanti Connect Secure (ICS) and Ivanti Policy Secure (IPS) products
US Agencies Told to Remove Ivanti's Affected Products From Federal NetworksThe U.S. Cybersecurity and Infrastructure Security Agency directed federal agencies to implement mitigation measures for two zero-day exploits that affect Ivanti’s popular VPN products while they await a patch, in what one official described as "a rapidly evolving situation."
CISA issued this year's first emergency directive ordering Federal Civilian Executive Branch (FCEB) agencies to immediately mitigate two Ivanti Connect Secure and Ivanti Policy Secure zero-day flaws in response to widespread and active exploitation by multiple threat actors. [...]
A Chinese hacking group has been exploiting a critical vCenter Server vulnerability (CVE-2023-34048) as a zero-day since at least late 2021. [...]
The overlooked vulnerability with real impacts
The first Chrome zero-day bug of 2024 adds to a growing list of actively exploited vulnerabilities found in Chromium and other browser technologies.
Google Fixes Out-of-Bounds Memory Access Flaw, Microsoft Edge Browser Also AffectedGoogle released an urgent fix for the first zero-day vulnerability of the year in its Chrome web browser, warning the bug is under active exploitation. Google blamed an out-of-bounds memory access flaw in its V8 JavaScript rendering engine. It also affects Microsoft Edge browser.
Citrix is warning of two zero-day security vulnerabilities in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway) that are being actively exploited in the wild
Google on Tuesday released updates to fix four security issues in its Chrome browser, including an actively exploited zero-day flaw
Anyone who hasn't mitigated two zero-day security bugs in Ivanti VPNs may already be compromised by a Chinese nation-state actor.
Citrix urged customers on Tuesday to immediately patch Netscaler ADC and Gateway appliances exposed online against two actively exploited zero-day vulnerabilities. [...]
Google has released security updates to fix the first Chrome zero-day vulnerability exploited in the wild since the start of the year. [...]
Customers still patchless and mitigation only goes so far There's a "reasonable chance" that Ivanti Connect Secure (ICS) VPN users are already compromised if they didn't apply the vulnerability mitigation released last week, experts say.…
Two zero-day vulnerabilities affecting Ivanti's Connect Secure VPN and Policy Secure network access control (NAC) appliances are now under mass exploitation. [...]