title: Junos OS: jdhcpd process crash when forwarding a malformed DHCP packet.
description: On Juniper Networks Junos OS devices configured as a DHCP forwarder, the Juniper Networks Dynamic Host Configuration Protocol Daemon (jdhcp) process might crash when receiving a malformed DHCP packet. This issue only affects devices configured as DHCP forwarder with forward-only option, that forward specified DHCP client packets, without creating a new subscriber session. The jdhcpd daemon automatically restarts without intervention, but continuous receipt of the malformed DHCP packet will repeatedly crash jdhcpd, leading to an extended Denial of Service (DoS) condition. This issue can be triggered only by DHCPv4, it cannot be triggered by DHCPv6. This issue affects Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S16; 12.3X48 versions prior to 12.3X48-D105 on SRX Series; 14.1X53 versions prior to 14.1X53-D60 on EX and QFX Series; 15.1 versions prior to 15.1R7-S7; 15.1X49 versions prior to 15.1X49-D221, 15.1X49-D230 on SRX Series; 15.1X53 versions prior to 15.1X53-D593 on EX2300/EX3400; 16.1 versions prior to 16.1R7-S5.
problem types: TBD
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 12.3R12-S16, status: affected, version: 12.3, versionType: custom
lessThan: 15.1R7-S7, status: affected, version: 15.1, versionType: custom
lessThan: 16.1R7-S5, status: affected, version: 16.1, versionType: custom
}
{
platforms: SRX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 12.3X48-D105, status: affected, version: 12.3X48, versionType: custom
lessThan: 15.1X49-D221, 15.1X49-D230, status: affected, version: 15.1X49, versionType: custom
}
{
platforms: EX and QFX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 14.1X53-D60, status: affected, version: 14.1X53, versionType: custom
}
{
platforms: EX2300/EX3400
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D593, status: affected, version: 15.1X53, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
version: 3.1
]
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue: Junos OS 12.3R12-S16, 12.3X48-D105, 15.1R7-S7, 15.1X49-D221, 15.1X49-D230, 15.1X53-D593, 16.1R7-S5, 16.2R1 and all subsequent releases.
workarounds: There are no viable workarounds for this issue.