A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18
The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R2-S13, 18.2R3-S8, 18.4R1-S8, 18.4R3-S8, 19.1R3-S4, 19.2R3-S2, 19.3R3-S1, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases.
There are no viable workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=All<17.3R3-S12 | 17.3R3-S12 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R2-S13 | 17.4R2-S13 | advisory ↗ |
| Juniper Networks Junos OS | >=18.1<18.1R3-S13 | 18.1R3-S13 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R3-S8 | 18.2R3-S8 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R3-S5 | 18.3R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R1-S8, 18.4R3-S8 | 18.4R1-S8, 18.4R3-S8 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R3-S4 | 19.1R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R3-S2 | 19.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R3-S1 | 19.3R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R3-S1 | 19.4R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R2 | 20.1R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R2 | 20.2R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R2 | 20.3R2 | advisory ↗ |