title: Junos OS: QFX5000 Series, EX4600 Series: In a VxLAN scenario an adjacent attacker within the VxLAN sending genuine packets may cause a DMA memory leak to occur.
description:
An Improper Input Validation vulnerability in the VxLAN packet forwarding engine (PFE) of Juniper Networks Junos OS on QFX5000 Series, EX4600 Series devices allows an unauthenticated, adjacent attacker, sending two or more genuine packets in the same VxLAN topology to possibly cause a DMA memory leak to occur under various specific operational conditions. The scenario described here is the worst-case scenario. There are other scenarios that require operator action to occur.
An indicator of compromise may be seen when multiple devices indicate that FPC0 has gone missing when issuing a show chassis fpc command for about 10 to 20 minutes, and a number of interfaces have also gone missing.
Use the following command to determine if FPC0 has gone missing from the device.
show chassis fpc detail
This issue affects:
Juniper Networks Junos OS on QFX5000 Series, EX4600 Series:
*  18.4 version 18.4R2 and later versions prior to 20.4R3-S8;
*  21.1 version 21.1R1 and later versions prior to 21.2R3-S6;
*  21.3 versions prior to 21.3R3-S5;
*  21.4 versions prior to 21.4R3-S4;
*  22.1 versions prior to 22.1R3-S3;
*  22.2 versions prior to 22.2R3-S1;
*  22.3 versions prior to 22.3R2-S2, 22.3R3;
*  22.4 versions prior to 22.4R2.
problem types: CWE-20 Improper Input Validation
affected:
{
defaultStatus: unaffected
platforms: [QFX5000 Series, EX4600 Series]
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 18.4*, status: affected, version: 18.4R2, versionType: semver
lessThan: 20.4R3-S8, status: affected, version: 20.4, versionType: semver
lessThan: 21.1*, status: affected, version: 21.1R1, versionType: semver
lessThan: 21.2R3-S6, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S5, status: affected, version: 21.3, versionType: semver
lessThan: 21.4R3-S4, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R3-S3, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R3-S1, status: affected, version: 22.2, versionType: semver
lessThan: 22.3R2-S2, 22.3R3, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R2, status: affected, version: 22.4, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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: 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S4, 22.1R3-S3, 22.2R3-S1, 22.3R2-S2, 22.3R3, 22.4R2, 23.2R1, and all subsequent releases.
workarounds: There are no available workarounds for this issue.