CVE-2009-2533: Realnetworks Helix Server

Medium severity, CVSS 5.0. EPSS: 3.4% chance of exploitation in the next 30 days.

rmserver in RealNetworks Helix Server and Helix Mobile Server before 13.0.0 allows remote attackers to cause a denial of service (daemon exit) via multiple RTSP SET_PARAMETER requests with empty DataConvertBuffer headers.

Affected products

• Realnetworks Helix Server: up to and including 12.0.1; version 12.0.0 only
• Realnetworks Helix Server Mobile: up to and including 12.0.0; version 11.0 only

Published 2009-07-20. Last modified 2026-06-16.