CVE-2021-27213

CVE-2021-27213 is a critical vulnerability affecting pystemon_project pystemon prior to 2021-02-13, allowing remote code execution due to insecure YAML deserialization in config.py. With a CVSS score of 9.8, this flaw is easily exploitable over the network without authentication, enabling attackers to achieve full compromise of confidentiality, integrity, and availability. While no public exploits or active exploitation have been observed, the high severity and ease of exploitation warrant immediate patching to mitigate this significant risk.