CVE-2005-3901: Macromedia Flash Communication Server

High severity, CVSS 7.8. EPSS: 1.5% chance of exploitation in the next 30 days.

Macromedia Flash Communication Server MX 1.0 and 1.5 does not sufficiently validate certain RTMP data, which allows attackers to cause a denial of service (instability or crash), as demonstrated using an alpha release build of Flash Player 8.5 (build 133).

Affected products

• Macromedia Flash Communication Server: version 1.0 only; version 1.5 only

Published 2005-11-29. Last modified 2026-06-16.