On Juniper Networks Junos OS platforms configured as DHCPv6 local server or DHCPv6 Relay Agent, the Juniper Networks Dynamic Host Configuration Protocol Daemon (JDHCPD) process might crash if a malformed DHCPv6 packet is received, resulting in a restart of the daemon. The daemon automatically restarts without intervention, but continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects DHCPv6. DHCPv4 is not affected by this issue. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S7; 19.1 versions prior to 19.1R3-S
The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R3-S7, 19.1R3-S5, 19.2R3-S2, 19.3R3-S2, 19.4R3-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R2, 21.1R1, and all subsequent releases.
There are no viable workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=17.3<17.3R3-S12 | 17.3R3-S12 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R3-S5 | 17.4R3-S5 | 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-S7 | 18.4R1-S8, 18.4R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R3-S5 | 19.1R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R3-S2 | 19.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R3-S2 | 19.3R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R3-S2 | 19.4R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R3 | 20.1R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R2-S3, 20.2R3 | 20.2R2-S3, 20.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R2 | 20.3R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.4<20.4R2 | 20.4R2 | advisory ↗ |