title: Junos OS: SRX Series: The flow processing daemon (flowd) will crash when Unified Policies are used with IPv6 and certain dynamic applications are rejected by the device
description: An Out-of-Bounds Write vulnerability in Flow Processing Daemon (flowd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause Denial of Service (DoS). On SRX Series devices using Unified Policies with IPv6, when a specific IPv6 packet goes through a dynamic-application filter which will generate an ICMP deny message, the flowd core is observed and the PFE is restarted. This issue affects: Juniper Networks Junos OS on SRX Series: 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S6; 19.4 versions prior to 19.4R3-S9; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S4; 20.4 versions prior to 20.4R3-S3; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R2; 21.4 versions prior to 21.4R2.
problem types: CWE-787 Out-of-bounds Write
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: 19.2, status: affected, lessThan: 19.2R3-S6, versionType: custom
version: 19.3, status: affected, lessThan: 19.3R3-S6, versionType: custom
version: 19.4, status: affected, lessThan: 19.4R3-S9, versionType: custom
version: 20.2, status: affected, lessThan: 20.2R3-S5, versionType: custom
version: 20.3, status: affected, lessThan: 20.3R3-S4, versionType: custom
version: 20.4, status: affected, lessThan: 20.4R3-S3, versionType: custom
version: 21.1, status: affected, lessThan: 21.1R3, versionType: custom
version: 21.2, status: affected, lessThan: 21.2R3, versionType: custom
version: 21.3, status: affected, lessThan: 21.3R2, versionType: custom
version: 21.4, status: affected, lessThan: 21.4R2, versionType: custom
platforms: SRX Series
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
]
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: 19.2R3-S6, 19.3R3-S6, 19.4R3-S9, 20.2R3-S5, 20.3R3-S4, 20.4R3-S3, 21.1R3, 21.2R3, 21.3R2, 21.4R2, 22.1R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.