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THE THREAT eSentire is aware of widespread exploitation attempts targeting the recently disclosed ownCloud vulnerability CVE-2023-49103. CVE-2023-49103 (CVSS: 10) is tracked as a disclosure of… READ NOW
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Waterloo, ON and GITEX GLOBAL 2023, Dubai, UAE – October 18, 2023 – eSentire, Inc., the Authority in Managed Detection and Response (MDR), today announced that Inspira Enterprise Inc, (Inspira), a… READ NOW
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eSentire has identified publicly available Proof-of-Concept (PoC) exploit code, for the critical Microsoft Exchange vulnerability CVE-2021-42321. CVE-2021-42321 was announced as part of Microsoft’s November Patch Tuesday release. Exploitation would allow a remote threat actor, with previous authentication, to execute code on vulnerable servers.
Prior to the patch release, Microsoft confirmed that limited exploitation of CVE-2021-42321 had occurred. The release of PoC exploit code significantly increases the likelihood of widespread exploitation in the near future. Organizations that have not already applied the relevant security patches are recommended to do so immediately.
At the time of this reporting, Microsoft has not shared details relating to the real-world exploitation of CVE-2021-42321. Based on limited public details, it appears that only a small number of attacks have occurred. All attacks to date are believed to have been performed by the same threat actor.
The release of PoC exploit code drastically increases the likelihood that multiple threat actor groups will adopt the exploit and use it in attacks in the near future. Additionally, technical details for CVE-2021-42321 have been released. eSentire has not observed exploitation at this time. It should be noted that in order for an attacker to successfully exploit this vulnerability, they would need to have gained prior authentication via a separate attack/vulnerability.