title: Junos OS: jdhcpd daemon crash due to invalid IPv6 UDP packets
description: The Juniper Enhanced jdhcpd daemon may experience high CPU utilization, or crash and restart upon receipt of an invalid IPv6 UDP packet. Both high CPU utilization and repeated crashes of the jdhcpd daemon can result in a denial of service as DHCP service is interrupted. No other Juniper Networks products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS 14.1X53 prior to 14.1X53-D12, 14.1X53-D38, 14.1X53-D40 on QFX, EX, QFabric System; 15.1 prior to 15.1F2-S18, 15.1R4 on all products and platforms; 15.1X49 prior to 15.1X49-D80 on SRX; 15.1X53 prior to 15.1X53-D51, 15.1X53-D60 on NFX, QFX, EX.
problem types: Denial of service
affected:
{
platforms: QFX, EX, QFabric System
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 14.1X53 prior to 14.1X53-D12, 14.1X53-D38, 14.1X53-D40
}
{
platforms: all products and platforms
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 15.1 prior to 15.1F2-S18, 15.1R4
}
{
platforms: SRX
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 15.1X49 prior to 15.1X49-D80
}
{
platforms: NFX, QFX, EX
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 15.1X53 prior to 15.1X53-D51, 15.1X53-D60
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.0
]
workarounds: Devices that have the ability to transition from Juniper's Enhanced DHCP server, JDHCPD, to the legacy DHCP server, DHCPD, can move back to legacy.
Devices that do not support the ability to transition from Enhanced DHCP to Legacy DHCP do not have a workaround available unless customers decide to disable the DHCP services and forward DHCP client requests to other DHCP servers or discontinue the use of DHCP services.