The AnimationThread function in Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 uses an incorrect argument to the sscanf function, which might allow remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via unknown vectors.
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.