Exploit / PoCcriticalExploited in the wild

FBI silently removed web shells planted on Microsoft Exchange servers

Security Affairsby @securityaffairsApr 14, 2021 · 10:20 UTC (Apr 14, 2021)3 min read2 · 1 read

Read at securityaffairs.com

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CVEs: CVE-2021-26855 CVE-2021-26857 CVE-2021-26858 CVE-2021-27065

Tags: cve-2021-26855 cve-2021-26857 cve-2021-26858 cve-2021-27065 exploit

Vulnerabilities mentioned

All

CVE	Vulnerability	CVSS	EPSS	Signals	Published
CVE-2021-26855 +3 related CVEs CVE-2021-27065 CVE-2021-26857 CVE-2021-26858	Unauthenticated SSRF/RCE in Microsoft Exchange Server (ProxyLogon)	9.1 group max	100%	KEVRansomwarePoC ×4	Mar 3, 2021 KEV Nov 3, 2021

From the original article

3 min read at securityaffairs.com

FBI log into web shells that hackers installed on Microsoft Exchange email servers across the US and removed the malicious code used by threat actors. A US judge granted the FBI the power to log into web shells that were injected by nation-state hackers on Microsoft Exchange servers across the US and remove the malware, announced the US Department of Justice.

Security Affairs

By @securityaffairs · securityaffairs.com

Read the full article at Security Affairs

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