title: Junos OS: vMX series: Predictable IP ID sequence numbers vulnerability
description: The vMX Series software uses a predictable IP ID Sequence Number. This leaves the system as well as clients connecting through the device susceptible to a family of attacks which rely on the use of predictable IP ID sequence numbers as their base method of attack. This issue was found during internal product security testing. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1F5 on vMX Series.
problem types: Improper Enforcement of Message Integrity During Transmission in a Communication Channel
affected:
{
platforms: vMX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1F5, status: affected, version: 15.1, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.3
baseSeverity: CRITICAL
confidentialityImpact: LOW
integrityImpact: NONE
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
version: 3.0
]
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: 15.1F5, and all subsequent releases.
workarounds: When used in whole, the following workaround methods may reduce the risk of information exfiltration from the customer environment, and reduce the chance of being subjected to, or propagating D/DoS attacks against other targets.
Deny incoming packets with invalid source addresses From reaching the device.
Utilize egress filtering to prevent invalid / spoofed packets from leaving your network(s).
Enable stateful firewall filters where possible.
Utilize SYN-based anti-flood protection mechanisms where possible to reduce or avoid D/DoS attacks.