title: Junos OS: jdhcpd crashes upon receiving a specific DHCP packet
description: A Improper Validation of Specified Index, Position, or Offset in Input vulnerability in the Juniper DHCP daemon (jdhcpd) of Juniper Networks Junos OS allows an adjacent unauthenticated attacker to cause a crash of jdhcpd and thereby a Denial of Service (DoS). In a scenario where DHCP relay or local server is configured the problem can be triggered if a DHCPv4 packet with specific options is received leading to a corruption of the options read from the packet. This corruption can then lead to jdhcpd crash and restart. This issue affects: Juniper Networks Junos OS 17.4R1 and later versions prior to 18.4R3-S10; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S8, 19.2R3-S4; 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R3-S6; 20.1 versions prior to 20.1R3-S2; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S2; 20.4 versions prior to 20.4R3-S1; 21.1 versions prior to 21.1R2-S2, 21.1R3; 21.2 versions prior to 21.2R1-S2, 21.2R2, 21.2R3; 21.3 versions prior to 21.3R1-S1, 21.3R2.
problem types: 1285
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 17.4*, status: affected, version: 17.4R1, versionType: custom
lessThan: 18.4R3-S10, status: affected, version: 18.4, versionType: custom
lessThan: 19.1R3-S7, status: affected, version: 19.1, versionType: custom
lessThan: 19.2R1-S8, 19.2R3-S4, status: affected, version: 19.2, versionType: custom
lessThan: 19.3R3-S4, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R3-S6, status: affected, version: 19.4, versionType: custom
lessThan: 20.1R3-S2, status: affected, version: 20.1, versionType: custom
lessThan: 20.2R3-S3, status: affected, version: 20.2, versionType: custom
lessThan: 20.3R3-S2, status: affected, version: 20.3, versionType: custom
lessThan: 20.4R3-S1, status: affected, version: 20.4, versionType: custom
lessThan: 21.1R2-S2, 21.1R3, status: affected, version: 21.1, versionType: custom
lessThan: 21.2R1-S2, 21.2R2, 21.2R3, status: affected, version: 21.2, versionType: custom
lessThan: 21.3R1-S1, 21.3R2, status: affected, version: 21.3, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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: 18.4R3-S10, 19.1R3-S7, 19.2R1-S8, 19.2R3-S4, 19.3R3-S4, 19.4R3-S6, 20.1R3-S2, 20.2R3-S3, 20.3R3-S2, 20.4R3-S1, 21.1R2-S2, 21.1R3, 21.2R1-S2, 21.2R2, 21.2R3, 21.3R1-S1, 21.3R2, 21.4R1, and all subsequent releases.
workarounds: There are no viable workarounds for this issue.