CVE-2021-3757

CVE-2021-3757 is a critical prototype pollution vulnerability affecting the immer_project immer library. This flaw allows an attacker to improperly modify object prototype attributes, potentially leading to arbitrary code execution or denial of service. With a CVSS score of 9.8 (CRITICAL), it presents a severe risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While there are no known public exploits (Metasploit, Nuclei, ExploitDB) or KEV entries, the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness and potential for future exploitation.