An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allows an attacker to send a valid BGP FlowSpec message thereby causing an unexpected change in the route advertisements within the BGP FlowSpec domain leading to disruptions in network traffic causing a Denial of Service (DoS) condition. Continued receipt of these update messages will cause a sustained Denial of Service condition. This issue affects Juniper Networks: Junos OS: All versions prior to 17.3R3-S10 with the exceptions of 15.1X49-D240 on SRX Series and 15.1R7-S8 on EX Series; 17.3 versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S6; 18.
The following software releases have been updated to resolve this specific issue: Junos OS: 15.1R7-S8, 15.1X49-D240, 17.3R3-S10, 17.4R2-S12, 17.4R3-S4, 18.1R3-S12, 18.2R2-S8, 18.2R3-S6, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R2-S2, 19.1R3-S3, 19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R1-S3, 19.4R2-S3, 19.4R3, 20.1R2, 20.2R1-S3, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases. Junos OS Evolved: 20.3R1-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.
There are no viable workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=15.1<15.1R7-S8 | 15.1R7-S8 | advisory ↗ |
| Juniper Networks Junos OS | >=15.1X49<15.1X490-D240 | 15.1X490-D240 | advisory ↗ |
| Juniper Networks Junos OS | >=17.3<17.3R3-S10 | 17.3R3-S10 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R2-S12, 17.4R3-S4 | 17.4R2-S12, 17.4R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=18.1<18.1R3-S12 | 18.1R3-S12 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R2-S8, 18.2R3-S6 | 18.2R2-S8, 18.2R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R3-S4 | 18.3R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R1-S8, 18.4R2-S6, 18.4R3-S6 | 18.4R1-S8, 18.4R2-S6, 18.4R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R1-S6, 19.1R2-S2, 19.1R3-S3 | 19.1R1-S6, 19.1R2-S2, 19.1R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R3-S1 | 19.2R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R2-S5, 19.3R3-S1 | 19.3R2-S5, 19.3R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R1-S3, 19.4R2-S3, 19.4R3 | 19.4R1-S3, 19.4R2-S3, 19.4R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R2 | 20.1R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R1-S3 20.2R2 | 20.2R1-S3 20.2R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R1-S1, 20.3R2 | 20.3R1-S1, 20.3R2 | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=unspecified<20.3R1-S1-EVO, 20.3R2-EVO | 20.3R1-S1-EVO, 20.3R2-EVO | advisory ↗ |