title: Junos OS: SRX Series: Denial of Service vulnerability in flowd due to multicast packets
description: The SRX flowd process, responsible for packet forwarding, may crash and restart when processing specific multicast packets. By continuously sending the specific multicast packets, an attacker can repeatedly crash the flowd process causing a sustained Denial of Service. This issue affects Juniper Networks Junos OS on SRX Series: 12.3X48 versions prior to 12.3X48-D90; 15.1X49 versions prior to 15.1X49-D180; 17.3 versions; 17.4 versions prior to 17.4R2-S5, 17.4R3; 18.1 versions prior to 18.1R3-S6; 18.2 versions prior to 18.2R2-S4, 18.2R3; 18.3 versions prior to 18.3R2-S1, 18.3R3; 18.4 versions prior to 18.4R2; 19.1 versions prior to 19.1R1-S1, 19.1R2.
problem types: Denial of Service (DoS)
affected:
{
platforms: SRX Series
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 17.3
lessThan: 12.3X48-D90, status: affected, version: 12.3X48, versionType: custom
lessThan: 15.1X49-D180, status: affected, version: 15.1X49, versionType: custom
lessThan: 17.4R2-S5, 17.4R3, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R3-S6, status: affected, version: 18.1, versionType: custom
lessThan: 18.2R2-S4, 18.2R3, status: affected, version: 18.2, versionType: custom
lessThan: 18.3R2-S1, 18.3R3, status: affected, version: 18.3, versionType: custom
lessThan: 18.4R2, status: affected, version: 18.4, versionType: custom
lessThan: 19.1R1-S1, 19.1R2, status: affected, version: 19.1, 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: 12.3X48-D90, 15.1X49-D180, 17.4R2-S5, 17.4R3, 18.1R3-S6, 18.2R2-S4, 18.2R3, 18.3R2-S1, 18.3R3, 18.4R2, 19.1R1-S1, 19.1R2, 19.2R1, and all subsequent releases.
workarounds: There are no available workarounds for this issue.