title: Junos OS: QFX5000 Series: DMA memory leak is observed when specific DHCP packets are transmitted over pseudo-VTEP
description:
An Improper Input Validation vulnerability in the Packet Forwarding Engine of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause memory leak, leading to Denial of Service (DoS).
On all Junos OS QFX5000 Series platforms, when pseudo-VTEP (Virtual Tunnel End Point) is configured under EVPN-VXLAN scenario, and specific DHCP packets are transmitted, DMA memory leak is observed. Continuous receipt of these specific DHCP packets will cause memory leak to reach 99% and then cause the protocols to stop working and traffic is impacted, leading to Denial of Service (DoS) condition. A manual reboot of the system recovers from the memory leak.
To confirm the memory leak, monitor for "sheaf:possible leak" and "vtep not found" messages in the logs.
This issue affects:
Juniper Networks Junos OS QFX5000 Series:
*  All versions prior to 20.4R3-S6;
*  21.1 versions prior to 21.1R3-S5;
*  21.2 versions prior to 21.2R3-S5;
*  21.3 versions prior to 21.3R3-S4;
*  21.4 versions prior to 21.4R3-S3;
*  22.1 versions prior to 22.1R3-S2;
*  22.2 versions prior to 22.2R2-S2, 22.2R3;
*  22.3 versions prior to 22.3R2-S1, 22.3R3;
*  22.4 versions prior to 22.4R1-S2, 22.4R2.
problem types: CWE-20 Improper Input Validation
affected:
{
defaultStatus: unaffected
platforms: QFX5000 Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S6, status: affected, version: 0, versionType: semver
lessThan: 21.1R3-S5, status: affected, version: 21.1, versionType: semver
lessThan: 21.2R3-S5, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S4, status: affected, version: 21.3, versionType: semver
lessThan: 21.4R3-S3, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R3-S2, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R2-S2, 22.2R3, status: affected, version: 22.2, versionType: semver
lessThan: 22.3R2-S1, 22.3R3, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R1-S2, 22.4R2, status: affected, version: 22.4, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
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: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-S6, 21.1R3-S5, 21.2R3-S5, 21.3R3-S4, 21.4R3-S3, 22.1R3-S2, 22.2R2-S2, 22.2R3, 22.3R2-S1, 22.3R3, 22.4R1-S2, 22.4R2, 23.2R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.