Blog Entries

08. 09. 2025 Alessandro Romboli Service Management

VMware ESXi Transparent Page Sharing

Scenario TPS (Transparent Page Sharing) is a proprietary functionality in VMware ESX(i) which essentially does deduplication of memory pages used for virtual machines. Identical memory content across multiple machines thus only consumes memory once. When you have multiple virtual machines with the same guest operating system running, there’s a high chance of identical content which…

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07. 02. 2023 Massimo Giaimo Blue Team, SEC4U

Ransomware Attack ESXi Servers with (to confirm) CVE-2021-21974

These days the landscape of cybercriminal activities seems to have as the only protagonists the Threat Actors who are carrying out an attack on publicly exposed VMware ESXi infrastructures. The French National Computer Emergency Response Team (CERT) published a security advisory on the ESXiArgs ransomware on February 3, 2023. Other important information regarding the attack was published…

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