When an MX Series Broadband Remote Access Server (BRAS) is configured as a Broadband Network Gateway (BNG) with DHCPv6 enabled, jdhcpd might crash when receiving a specific crafted DHCP response message on a subscriber interface. The daemon automatically restarts without intervention, but continuous receipt of specific crafted DHCP messages will repeatedly crash jdhcpd, leading to an extended Denial of Service (DoS) condition. This issue only affects systems configured with DHCPv6 enabled. DHCPv4 is unaffected by this issue. This issue affects Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S5 on MX Series; 16.1 versions prior to 16.1R7-S5 on MX Series; 16.2 versions prior to 16.2R2-S10 on MX Series; 17.1 versions prior to 17.1R3-S1 on MX Series; 17.2 versions prior to 17.2R3-S2 o
The following software releases have been updated to resolve this specific issue: 15.1R7-S5, 16.1R7-S5, 16.2R2-S10, 17.1R3-S1, 17.2R3-S2, 17.3R3-S6, 17.4R2-S5, 17.4R3, 18.1R3-S6, 18.2R2-S4, 18.2R3, 18.2X75-D50, 18.3R1-S5, 18.3R3, 18.4R2, 19.1R1-S2, 19.1R2, 19.2R1, 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-S5 | 15.1R7-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=16.1<16.1R7-S5 | 16.1R7-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=16.2<16.2R2-S10 | 16.2R2-S10 | advisory ↗ |
| Juniper Networks Junos OS | >=17.1<17.1R3-S1 | 17.1R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=17.2<17.2R3-S2 | 17.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=17.3<17.3R3-S6 | 17.3R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R2-S5, 17.4R3 | 17.4R2-S5, 17.4R3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.1<18.1R3-S6 | 18.1R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R2-S4, 18.2R3 | 18.2R2-S4, 18.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2X75<18.2X75-D50 | 18.2X75-D50 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R1-S5, 18.3R3 | 18.3R1-S5, 18.3R3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R2 | 18.4R2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R1-S2, 19.1R2 | 19.1R1-S2, 19.1R2 | advisory ↗ |