title: Junos OS and Junos OS Evolved: A specific BGP UPDATE message will cause a crash in the backup Routing Engine in NSR-enabled devices
description:
A Heap-based Buffer Overflow vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).
If an attacker sends a specific BGP UPDATE message to the device, this will cause a memory overwrite and therefore an RPD crash and restart in the backup Routing Engine (RE). Continued receipt of these packets will cause a sustained Denial of Service (DoS) condition in the backup RE.
The primary RE is not impacted by this issue and there is no impact on traffic.
This issue only affects devices with NSR enabled.
Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.
This issue requires an attacker to have an established BGP session to a system affected by the issue. This issue affects both eBGP and iBGP implementations.
This issue affects:
Juniper Networks Junos OS
*  All versions earlier than 20.4R3-S9;
*  21.2 versions earlier than 21.2R3-S7;
*  21.3 versions earlier than 21.3R3-S5;
*  21.4 versions earlier than 21.4R3-S5;
*  22.1 versions earlier than 22.1R3-S4;
*  22.2 versions earlier than 22.2R3-S2;
*  22.3 versions earlier than 22.3R3-S1;
*  22.4 versions earlier than 22.4R2-S2, 22.4R3;
*  23.1 versions earlier than 23.1R2;
*  23.2 versions earlier than 23.2R1-S2, 23.2R2.
Juniper Networks Junos OS Evolved
*  All versions earlier than 21.3R3-S5-EVO;
*  21.4-EVO versions earlier than 21.4R3-S5-EVO;
*  22.1-EVO versions earlier than 22.1R3-S4-EVO;
*  22.2-EVO versions earlier than 22.2R3-S2-EVO;
*  22.3-EVO versions later than 22.3R1-EVO;
*  22.4-EVO versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;
*  23.1-EVO versions earlier than 23.1R2-EVO;
*  23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO.
problem types: CWE-122 Heap-based Buffer Overflow
affected:
{
defaultStatus: unaffected
platforms: [MX Series, PTX Series, ACX Series, EX Series, QFX Series]
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S9, status: affected, version: 0, versionType: semver
lessThan: 21.2R3-S7, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S5, status: affected, version: 21.3, versionType: semver
lessThan: 21.4R3-S5, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R3-S4, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R3-S2, status: affected, version: 22.2, versionType: semver
lessThan: 22.3R3-S1, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R2-S2, 22.4R3, status: affected, version: 22.4, versionType: semver
lessThan: 23.1R2, status: affected, version: 23.1, versionType: semver
lessThan: 23.2R1-S2, 23.2R2, status: affected, version: 23.2, versionType: semver
}
{
defaultStatus: unaffected
platforms: [PTX Series, ACX Series, QFX Series]
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 21.3R3-S5-EVO, status: affected, version: 0, versionType: semver
lessThan: 21.4R3-S5-EVO, status: affected, version: 21.4-EVO, versionType: semver
lessThan: 22.1R3-S4-EVO, status: affected, version: 22.1-EVO, versionType: semver
lessThan: 22.2R3-S2-EVO, status: affected, version: 22.2-EVO, versionType: semver
lessThan: 22.4R2-S2-EVO, 22.4R3-EVO, status: affected, version: 22.4-EVO, versionType: semver
lessThan: 23.1R2-EVO, status: affected, version: 23.1-EVO, versionType: semver
lessThan: 23.2R1-S2-EVO, 23.2R2-EVO, status: affected, version: 23.2-EVO, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
version: 3.1
]
format: CVSS
scenarios: GENERAL
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: 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.1R2, 23.2R1-S2, 23.2R2, 23.3R1, 23.4R1, and all subsequent releases.
Junos OS Evolved: 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S2-EVO, 22.4R2-S2-EVO, 22.4R3-EVO, 23.1R2-EVO, 23.2R1-S2-EVO, 23.2R2-EVO, 23.3R1-EVO, 23.4R1-EVO, and all subsequent releases.
workarounds: There are no known workarounds for this issue.