title: Junos OS: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core.
description: Due to an improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved the Routing Protocol Daemon (RPD) service, upon receipt of a specific matching BGP packet meeting a specific term in the flowspec configuration, crashes and restarts causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec deployments. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: All versions after 18.4R1-EVO prior to 20.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved versions prior to 18.4R1-EVO.
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 18.4R1, status: unaffected, version: unspecified, versionType: custom
lessThan: 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, status: affected, version: 18.4, versionType: custom
lessThan: 19.1R2-S2, 19.1R3-S4, status: affected, version: 19.1, versionType: custom
lessThan: 19.2R1-S6, 19.2R3-S2, status: affected, version: 19.2, versionType: custom
lessThan: 19.3R3-S2, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R2-S4, 19.4R3-S1, status: affected, version: 19.4, versionType: custom
lessThan: 20.1R2, 20.1R3, 20.1R3-EVO, status: affected, version: 20.1, versionType: custom
lessThan: 20.2R2, 20.2R3, 20.2R3-EVO, status: affected, version: 20.2, versionType: custom
lessThan: 20.3R1-S1, 20.3R2, 20.3R2-EVO, status: affected, version: 20.3, versionType: custom
}
{
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 18.4R1-EVO, status: unaffected, version: unspecified, versionType: custom
lessThan: 20.3R2-EVO, status: affected, version: 20.3-EVO, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/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:
Junos OS: 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1 and all subsequent releases.
Junos OS Evolved: 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.
workarounds: Do not configure "family inet6-vpn flow" under BGP if no inet6-vpn routes are required to be received.