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During a recent engagement, I discovered a machine that is running VMware ESXi 6.7.0. Upon inspecting any known vulnerabilities associated with this version of the software, I identified it may be vulnerable to ESXi OpenSLP heap-overflow (CVE-2021–21974). Through googling, I found a blog post by Lucas Leong (@_wmliang_) of Trend Micro’s Zero Day Initiative, who is the security researcher that found this bug. Lucas wrote a brief overview on how to exploit the vulnerability but share no reference to a PoC. Since I couldn’t find any existing PoC on the internet, I thought it would be neat to develop an exploit based on Lucas’ approach. Before proceeding, I highly encourage fellow readers to review Lucas’ blog to get an overview of the bug and exploitation strategy from the founder’s perspective.