FFmpeg Multiple Vulnerabilities

Some vulnerabilities have been reported in FFmpeg, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise an application using the library.

1. Some errors within libavcodec/vmnc.c can be exploited to cause out of bounds read memory accesses.
2. Some integer overflow errors within the "decode_frame()" function (libavcodec/vmnc.c) can be exploited to cause heap-based buffer overflows.

Successful exploitation of vulnerability #2 may allow execution of arbitrary code.