![]() It provides a numerical (0-10) representation of the severity of an information The Common Vulnerability Scoring System (CVSS)ĬVSS is a free and open industry standard for assessing the severity of computer system security The CVE system is used to identify, define, catalogue and publicly disclosed known information-security Systems used for reporting and assessing the severity of security vulnerabilities No.Ĭommon Vulnerabilities and Exposures (CVE). Were also publicly disclosed on the same date. Three (3) further CVE Reports related to the Exchange server and to CVE-2021-26855 ![]() Microsoft attributed the action to the Advanced Persistent Threat (APT) Volexity reported they had first observed theĮxploit on the 03rd Jan 2021. Vulnerability and Exposure (CVE) Report CVE-2021-26855. On the 02nd Mar 2021, the Microsoft Security Response Center (MSRC) publicly disclosed Common OWA allows a user to access email, calendars, tasks and contacts from an on-premise Exchange Images, JavaScript, cascading style sheets, and fonts used by the browser-based application, Outlook Web Access Services (IIS) logs from the Exchange servers, revealed inbound POST requests to valid files associated with A large amount of data was identifiedīeing sent to IP addresses not tied to the legitimate users. ![]() In January 2021, the US based security firm Volexity, which assists organisations with incident response,ĭigital forensics and threat intelligence services detected anomalous activity from two (2) of its customers'Įxchange servers through its network security monitoring service. (SMTP) is used to communicate to other internet mail servers. Support for Post Office Protocol version 3 (POP3), Internet Message Access Protocol (IMAP)Īnd Exchange ActiveSync (EAS) protocols was subsequently added. Uses a proprietary protocol called Messaging Application Programming Interface (MAPI) to talk to emailĬlients. That runs exclusively on the Microsoft Windows server operating system. The Exchange server is Microsoft's email, calendaring, contact, scheduling and collaboration platform CVE-2021-26855 - Vulnerable Exchange Server Description
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