CVE-2019-25220

CVE-2019-25220 is a denial-of-service vulnerability affecting Bitcoin Core versions prior to 24.0.1. Remote attackers can crash the daemon by flooding it with low-difficulty header chains, a technique known as a "Chain Width Expansion" attack, due to insufficient work verification before storage. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity and a high impact on availability. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.