QuickTimeにまた危険度の高い脆弱性、実証コードも公開済み - INTERNET Watch

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Blocking outbound access to 554/tcp and 6970-6999/udp may partially mitigate this vulnerability. Since RTSP may use a variety of port numbers, blocking the protocol based on a particular port may not be sufficient.

Vulnerability Note VU#112179 Apple QuickTime RTSP Response message Reason-Phrase buffer overflow vulnerability - US-CERT