On Juniper Networks EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series deployed as a Virtual Chassis with a specific Layer 2 circuit configuration, Packet Forwarding Engine manager (FXPC) process may crash and restart upon receipt of specific layer 2 frames. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series 15.1 versions prior to 15.1R7-S9.

17.3 versions prior to 17.3R3-S11.

17.4 versions prior to 17.4R2-S13, 17.4R3-S4, 17.4R3-S5.

18.2 versions prior to 18.2R3-S8.

18.3 versions prior to 18.3R3-S4.

18.4 versions prior to 18.4R2-S7, 18.4R3-S6.

19.1 versions prior to 19.1R3-S4.

19.2 versions prior to 19.2R1-S6, 19.2R3-S1.

19.3 versions prior to 19.3R3-S1.

19.4 versions prior to 19.4R2-S4, 19.4R3-S1.

20.1 versions prior to 20.1R2.

20.2 versions prior to 20.2R2, 20.2R3.

20.3 versions prior to 20.3R1-S2, 20.3R2;.