CVE-2013-3220

CVE-2013-3220 describes a denial-of-service vulnerability affecting bitcoind and Bitcoin-Qt versions prior to 0.4.9rc2, 0.5.8rc2, 0.6.5rc2, and 0.7.3rc2, as well as wxBitcoin. The flaw stems from improper handling of block sizes, which could lead to an excessive number of database locks in Berkeley DB. This allows remote attackers to cause a network split and potentially enable double-spending through a large malicious block. Rated with a CVSS score of 6.4, this vulnerability is considered medium severity. It can be exploited remotely with low attack complexity, requiring no authentication, and primarily impacts availability and integrity (partial). There is no evidence of active exploitation, nor are there known public exploit codes available in Metasploit, Nuclei, or ExploitDB. The vulnerability has received minimal community attention and media coverage, suggesting it is not widely discussed or targeted.