CVE-2021-29922

CVE-2021-29922 is a critical vulnerability affecting Rust versions prior to 1.53.0, specifically within the library/std/src/net/parser.rs component. It allows attackers to bypass IP-based access controls by exploiting an unexpected octal interpretation of IP address strings containing extraneous leading zero characters. With a CVSS score of 9.1 (CRITICAL), this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to high integrity and availability impacts. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.