title: Junos OS and Junos OS Evolved: An rpd crash can occur due to memory corruption caused by flapping BGP sessions
description: A Use After Free vulnerability in the Routing Protocol Daemon (rdp) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker to cause Denial of Service (DoS). When a BGP session flap happens, a Use After Free of a memory location that was assigned to another object can occur, which will lead to an rpd crash. This is a race condition that is outside of the attacker's control and cannot be deterministically exploited. Continued flapping of BGP sessions can create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: All versions prior to 18.4R2-S9, 18.4R3-S11; 19.1 versions prior to 19.1R3-S8; 19.2 version 19.2R1 and later versions; 19.3 versions prior to 19.3R3-S5; 19.4 versions prior to 19.4R2-S6, 19.4R3-S6; 20.1 version 20.1R1 and later versions; 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 21.1R3-S3; 21.2 versions prior to 21.2R2-S1, 21.2R3. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S4-EVO; 21.1-EVO versions prior to 21.1R3-S2-EVO; 21.2-EVO versions prior to 21.2R3-EVO; 21.3-EVO versions prior to 21.3R2-EVO.
problem types: CWE-416 Use After Free
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: unspecified, lessThan: 18.4R2-S9, 18.4R3-S11, status: affected, versionType: custom
version: 19.1, status: affected, lessThan: 19.1R3-S8, versionType: custom
version: 19.2R1, status: affected, lessThan: 19.2*, versionType: custom
version: 19.3, status: affected, lessThan: 19.3R3-S5, versionType: custom
version: 19.4, status: affected, lessThan: 19.4R2-S6, 19.4R3-S6, versionType: custom
version: 20.1R1, status: affected, lessThan: 20.1*, versionType: custom
version: 20.2, status: affected, lessThan: 20.2R3-S3, versionType: custom
version: 20.3, status: affected, lessThan: 20.3R3-S2, versionType: custom
version: 20.4, status: affected, lessThan: 20.4R3-S1, versionType: custom
version: 21.1, status: affected, lessThan: 21.1R3-S3, versionType: custom
version: 21.2, status: affected, lessThan: 21.2R2-S1, 21.2R3, versionType: custom
}
{
vendor: Juniper Networks
product: Junos OS Evolved
versions:
version: unspecified, lessThan: 20.4R3-S4-EVO, status: affected, versionType: custom
version: 21.1-EVO, status: affected, lessThan: 21.1R3-S2-EVO, versionType: custom
version: 21.2-EVO, status: affected, lessThan: 21.2R3-EVO, versionType: custom
version: 21.3-EVO, status: affected, lessThan: 21.3R2-EVO, versionType: custom
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector: NETWORK
attackComplexity: HIGH
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 5.9
baseSeverity: MEDIUM
]
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: 18.4R2-S9, 18.4R3-S11, 19.1R3-S8, 19.3R3-S5, 19.4R2-S6, 19.4R3-S6, 20.2R3-S3, 20.3R3-S2, 20.4R3-S1, 21.1R3-S3, 21.2R2-S1, 21.2R3, 21.3R1, and all subsequent releases.
Junos OS Evolved: 20.4R3-S4-EVO, 21.1R3-S2-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-EVO, and all subsequent releases.
workarounds: There are no viable workarounds for this issue.