What is CVE-2019-0007?

CVE-2019-0007 is a critical-severity vulnerability in Juniper Junos, classified under Use of Insufficiently Random Values. CVSS score: 9.3/10. Published 2019-01-15.

How severe is CVE-2019-0007?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Vulnerability in Juniper Junos

CVE-2019-0007

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.

Published 2019-01-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.017 (77.6th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-330 — Use of Insufficiently Random Values

References

kb.juniper.net/JSA10903 (Vendor Advisory)
www.securityfocus.com/bid/106564 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2019-0007?: CVE-2019-0007 is a critical-severity vulnerability in Juniper Junos, classified under Use of Insufficiently Random Values. CVSS score: 9.3/10. Published 2019-01-15.
How severe is CVE-2019-0007?: Critical severity. CVSS v3 base score is 9.3 out of 10.