Unspecified vulnerability in the Apache Solr for TYPO3 (solr) extension before 2.8.3 for TYPO3 has unknown impact and remote attack vectors, related to "Insecure Unserialize."
http://www.securityfocus.com/bid/62674
http://typo3.org/teams/security/security-bulletins/typo3-extensions/typo3-ext-sa-2013-009/