CVE-2013-6167

CVE-2013-6167 describes a vulnerability in Mozilla Firefox versions through 27 where the browser fails to validate the character set of HTTP Cookie headers. This oversight allows remote attackers to perform a persistent Logout CSRF attack by coercing a web application into setting a malformed cookie. The vulnerability has a CVSS score of 6.8, indicating medium severity with potential for partial confidentiality, integrity, and availability impact, and requires medium attack complexity. While there is an ExploitDB entry for a denial-of-service related to cookie verification, there is no evidence of active exploitation, Metasploit or Nuclei modules, or significant community discussion or media coverage.