title: Junos OS and Junos OS Evolved: Malformed BGP flowspec update causes RPD crash
description: An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network based, unauthenticated attacker to cause an RPD crash leading to a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. Upon receipt of a malformed BGP flowspec update, RPD will crash resulting in a Denial of Service. This issue affects Juniper Networks Junos OS: All versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2; Juniper Networks Junos OS Evolved: All versions prior to 20.1R3-EVO; 20.2 versions prior to 20.2R2-EVO; 20.3 versions prior to 20.3R2-EVO;
problem types: CWE-130 Improper Handling of Length Parameter Inconsistency
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: unspecified, lessThan: 18.1R3-S11, status: affected, versionType: custom
version: 18.2, status: affected, lessThan: 18.2R3-S6, versionType: custom
version: 18.3, status: affected, lessThan: 18.3R3-S4, versionType: custom
version: 18.4, status: affected, lessThan: 18.4R3-S6, versionType: custom
version: 19.1, status: affected, lessThan: 19.1R3-S4, versionType: custom
version: 19.2, status: affected, lessThan: 19.2R3-S1, versionType: custom
version: 19.3, status: affected, lessThan: 19.3R3-S1, versionType: custom
version: 19.4, status: affected, lessThan: 19.4R3, versionType: custom
version: 20.1, status: affected, lessThan: 20.1R2, versionType: custom
version: 20.2, status: affected, lessThan: 20.2R2, versionType: custom
version: 20.3, status: affected, lessThan: 20.3R1-S1, 20.3R2, versionType: custom
}
{
vendor: Juniper Networks
product: Junos OS Evolved
versions:
version: unspecified, lessThan: 20.1R3-EVO, status: affected, versionType: custom
version: 20.2, status: affected, lessThan: 20.2R2-EVO, versionType: custom
version: 20.3, status: affected, lessThan: 20.3R2-EVO, versionType: custom
}
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:
Junos OS: 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S4, 19.2R3-S1, 19.3R3-S1, 19.4R3, 20.1R2, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases.
Junos OS Evolved: 20.1R3-EVO, 20.2R2-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.
workarounds: There are no known workarounds for this issue.