Race condition in the Op command in Juniper Junos OS before 12.1X44-D55 12.1X46 before 12.1X46-D40 12.1X47 before 12.1X47-D25 12.3 before 12.3R11 12.3X48 before 12.3X48-D20 12.3X50 before 12.3X50-D50 13.2 before 13.2R8 13.2X51 before 13.2X51-D39 13.2X52 before 13.2X52-D30 13.3 before 13.3R7 14.1 before 14.1R6 14.1X53 before 14.1X53-D30 14.2 before 14.2R4 15.1 before 15.1F2 or 15.1R2 15.1X49 before 15.1X49-D10 or 15.1X49-D20 and 16.1 before 16.1R1 allows remote authenticated users to gain privileges via the URL option.