CVE-2009-4248: Realnetworks Helix Player

High severity, CVSS 9.3. EPSS: 6.8% chance of exploitation in the next 30 days.

Buffer overflow in the RTSPProtocol::HandleSetParameterRequest function in client/core/rtspprotocol.cpp in RealNetworks RealPlayer 10, RealPlayer 10.5 6.0.12.1040 through 6.0.12.1741, RealPlayer 11 11.0.0 through 11.0.4, RealPlayer Enterprise, Mac RealPlayer 10 and 10.1, Linux RealPlayer 10, and Helix Player 10.x allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted RTSP SET_PARAMETER request.

Affected products

• Realnetworks Helix Player: version 10.0 only; version 11.0.0 only; version 11.0.1 only
• Realnetworks Realplayer: version 10.0 only; version 10.5 only; version 11.0 only; version 11.0.1 only; version 11.0.2 only; version 11.0.3 only; …
• Realnetworks Realplayer Enterprise: any version
• Realnetworks Realplayer SP: version 1.0.0 only; version 1.0.1 only

Published 2010-01-25. Last modified 2026-06-16.