Heap-based buffer overflow in the nsCaseTransformTextRunFactory::TransformString function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to cause a denial of service (boolean out-of-bounds write) or possibly have unspecified other impact via Unicode characters that are mishandled during text conversion.
49.0+build4-0ubuntu0.14.04.11:45.4.0+build1-0ubuntu0.14.04.149.0+build4-0ubuntu0.16.04.11:45.4.0+build1-0ubuntu0.16.04.1Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:HI:HA:HCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H