Off-by-one buffer overflow in the processing of tags in Real Metadata Package (RMP) files in RealPlayer 10.5 (6.0.12.1040) and earlier could allow remote attackers to execute arbitrary code via a long tag.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18982
http://www.ngssoftware.com/advisories/real-03full.txt
http://service.real.com/help/faq/security/040928_player/EN/