An out-of-bounds read vulnerability with the Opus encoder when the number of channels in an audio stream changes while the encoder is in use. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.
https://www.mozilla.org/security/advisories/mfsa2017-17/
https://www.mozilla.org/security/advisories/mfsa2017-16/
https://www.mozilla.org/security/advisories/mfsa2017-15/
https://www.debian.org/security/2017/dsa-3918
https://www.debian.org/security/2017/dsa-3881
https://bugzilla.mozilla.org/show_bug.cgi?id=1368490
https://access.redhat.com/errata/RHSA-2017:1561
https://access.redhat.com/errata/RHSA-2017:1440