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Late last week, unknown attackers launched a widespread ransomware attack hitting VMware ESXi hypervisors via CVE-2021-21974, an easily exploitable vulnerability that allows them to run exploit code remotely, without prior authentication. Patches for CVE-2021-21974, a vulnerability in ESXi’s OpenSLP service, have been provided by VMware two years ago, and this attack has revealed just how many servers are out there are still unpatched, with the SLP service still running and the OpenSLP port (427) still … More → The post Thousands of unpatched VMware ESXi servers hit by ransomware via old bug (CVE-2021-21974) appeared first on Help Net Security.