The browser engine in Mozilla Firefox before 2.0.0.12, Thunderbird before 2.0.0.12, and SeaMonkey before 1.1.8 allows remote attackers to cause a denial of service (crash) and possibly trigger memory corruption via vectors related to the (1) nsTableFrame::GetFrameAtOrBefore, (2) nsAccessibilityService::GetAccessible, (3) nsBindingManager::GetNestedInsertionPoint, (4) nsXBLPrototypeBinding::AttributeChanged, (5) nsColumnSetFrame::GetContentInsertionFrame, and (6) nsLineLayout::TrimTrailingWhiteSpaceIn methods, and other vectors.