CVE-2013-1821

CVE-2013-1821 describes a denial-of-service vulnerability in the REXML parser within Ruby versions prior to 1.9.3-p392. This flaw, an XML Entity Expansion (XEE) attack, allows remote attackers to cause memory exhaustion and application crashes by submitting specially crafted XML documents with malicious text nodes. The vulnerability has a CVSS score of 5.0, indicating a medium severity, with low attack complexity and no authentication required, leading to a partial availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.