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.
Microsoft on Friday disclosed that a single activity group in August 2022 achieved initial access and breached Exchange servers by chaining the two newly disclosed zero-day flaws in a limited set of attacks aimed at less than 10 organizations globally
While organizations wait for an official patch for the two zero-day flaws in Microsoft Exchange, they should scan their networks for signs of exploitation and apply these mitigations.
Microsoft Corp. is investigating reports that attackers are exploiting two previously unknown vulnerabilities in Exchange Server, a technology many organizations rely on to send and receive email. Microsoft says it is expediting work on software patches to plug the security holes. In the meantime, it is urging a subset of Exchange customers to enable a setting that could help mitigate ongoing attacks.
The vulnerabilities were first discovered by Vietnamese cybersecurity firm GTSC
Double-play 0-day in Exchange - what you need to know, and what you can do
Microsoft officially disclosed it investigating two zero-day security vulnerabilities impacting Exchange Server 2013, 2016, and 2019 following reports of in-the-wild exploitation
Microsoft has confirmed that two recently reported zero-day vulnerabilities in Microsoft Exchange Server 2013, 2016, and 2019 are being exploited in the wild. [...]
Security researchers are warning of previously undisclosed flaws in fully patched Microsoft Exchange servers being exploited by malicious actors in real-world attacks to achieve remote code execution on affected systems
Remember this next time Microsoft talks about how seriously it takes security Security researchers have warned a zero-day flaw in Microsoft’s Exchange server is being actively exploited.…
Threat actors are exploiting yet-to-be-disclosed Microsoft Exchange zero-day bugs allowing for remote code execution, according to claims made by security researchers at Vietnamese cybersecurity outfit GTSC, who first spotted and reported the attacks. [...]
Threat actors are exploiting yet-to-be-disclosed Microsoft Exchange zero-day bugs allowing for remote code execution, according to claims made by security researchers at Vietnamese cybersecurity outfit GTSC, who first spotted and reported the attacks. [...]
Threat actors are exploiting yet-to-be-disclosed Microsoft Exchange zero-day bugs allowing for remote code execution, according to claims made by security researchers at Vietnamese cybersecurity outfit GTSC, who first spotted and reported the attacks. [...]
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