An Improper Input Validation vulnerability in the active-lease query portion in JDHCPD's DHCP Relay Agent of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending a crafted DHCP packet to the device thereby crashing the jdhcpd DHCP service. This is typically configured for Broadband Subscriber Sessions. Continued receipt and processing of this crafted packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Junos OS Evolved.
The following software releases have been updated to resolve this specific issue: Junos OS: 19.4R3-S1, 20.1R2-S1, 20.1R3, 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 | >=19.4<19.4R3-S1 | 19.4R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R2-S1, 20.1R3 | 20.1R2-S1, 20.1R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R3 | 20.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R2 | 20.3R2 | advisory ↗ |