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A malware campaign exploits Microsoft Exchange Server flaws

Security Affairsby @securityaffairsMay 22, 2024 · 13:21 UTC (May 22, 2024)1 min read2 · 1 read

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CVEs: CVE-2021-34473 CVE-2021-34523 CVE-2021-31207

Tags: cve-2021-34473 cve-2021-34523 cve-2021-31207 malware

Vulnerabilities mentioned

All

CVE	Vulnerability	CVSS	EPSS	Signals	Published
CVE-2021-31207	Security feature bypass in Microsoft Exchange Server (ProxyShell) enables webshell RCE	6.6	100%	KEVRansomwarePoC	May 11, 2021 KEV Nov 3, 2021
CVE-2021-34473 +1 related CVE CVE-2021-34523	SSRF (CWE-918) in Microsoft Exchange Server Enabling RCE (ProxyShell)	9.1 group max	100%	KEVRansomwarePoC	Jul 14, 2021 KEV Nov 3, 2021

From the original article

1 min read at securityaffairs.com

A threat actor is targeting organizations in Africa and the Middle East by exploiting Microsoft Exchange Server flaws to deliver malware. Positive Technologies researchers observed while responding to a customer’s incident spotted an unknown keylogger embedded in the main Microsoft Exchange Server page. The keylogger was used to collect account credentials.

Security Affairs

By @securityaffairs · securityaffairs.com

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