On Juniper Networks MX Series and EX9200 Series, in a certain condition the IPv6 Distributed Denial of Service (DDoS) protection might not take affect when it reaches the threshold condition. The DDoS protection allows the device to continue to function while it is under DDoS attack, protecting both the Routing Engine (RE) and the Flexible PIC Concentrator (FPC) during the DDoS attack. When this issue occurs, the RE and/or the FPC can become overwhelmed, which could disrupt network protocol operations and/or interrupt traffic. This issue does not affect IPv4 DDoS protection. This issue affects MX Series and EX9200 Series with Trio-based PFEs (Packet Forwarding Engines). Please refer to https://kb.juniper.net/KB25385 for the list of Trio-based PFEs. This issue affects Juniper Networks Junos
The following software releases have been updated to resolve this specific issue: Junos OS 17.2R3-S4, 17.2X75-D102, 17.2X75-D110, 17.3R3-S8, 17.4R2-S11, 17.4R3-S2, 18.2R2-S7, 18.2R3, 18.2R3-S3, 18.2X75-D30, 18.3R2-S4, 18.3R3-S2, 18.4R1, and all subsequent releases.
There are no viable workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=17.2<17.2R3-S4 | 17.2R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=17.2X75<17.2X75-D102, 17.2X75-D110 | 17.2X75-D102, 17.2X75-D110 | advisory ↗ |
| Juniper Networks Junos OS | >=17.3<17.3R3-S8 | 17.3R3-S8 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R2-S11, 17.4R3-S2 | 17.4R2-S11, 17.4R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R2-S7, 18.2R3, 18.2R3-S3 | 18.2R2-S7, 18.2R3, 18.2R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2X75<18.2X75-D30 | 18.2X75-D30 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R2-S4, 18.3R3-S2 | 18.3R2-S4, 18.3R3-S2 | advisory ↗ |