CVE-2021-30189

CVE-2021-30189 is a critical stack-based buffer overflow vulnerability affecting the CODESYS V2 Web-Server, specifically versions prior to 1.1.9.20, and impacting products from vendors like CODESYS and WAGO. With a CVSS score of 9.8 (Critical), it allows for unauthenticated remote exploitation over the network with low attack complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While highly severe, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.