What is CVE-2018-0051?

CVE-2018-0051 is a high-severity vulnerability in Juniper Junos, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-10-10.

How severe is CVE-2018-0051?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Juniper Junos

CVE-2018-0051

A Denial of Service vulnerability in the SIP application layer gateway (ALG) component of Junos OS based platforms allows an attacker to crash MS-PIC, MS-MIC, MS-MPC, MS-DPC or SRX flow daemon (flowd) process. This issue affects Junos OS devices with NAT or stateful firewall configuration in combination with the SIP ALG enabled. SIP ALG is enabled by default on SRX Series devices except for SRX-HE devices. SRX-HE devices have SIP ALG disabled by default. The status of ALGs in SRX device can be obtained by executing the command: show security alg status Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D77; 12.3X48 versions prior to 12.3X48-D70; 15.1X49 versions prior to 15.1X49-D140; 15.1 versions prior to 15.1R4-S9, 15.1R7-S1; 15.1F6; 16.1 versions prior to 16.1R4-S9, 16.1R6-S1, 16.1R7; 16.2 versions prior to 16.2R2-S7, 16.2R3; 17.1 versions prior to 17.1R2-S7, 17.1R3; 17.2 versions prior to 17.2R1-S6, 17.2R2-S4, 17.2R3; 17.3 versions prior to 17.3R1-S5, 17.3R2-S2, 17.3R3; 17.4 versions prior to 17.4R2. No other Juniper Networks products or platforms are affected by this issue.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-10-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.8th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Juniper Junos — versions 12.1x46, 12.3x48, 15.1x49
Juniper Networks Junos OS — versions 17.1, 16.1, 12.1X46

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

kb.juniper.net/JSA10885 (Vendor Advisory)
www.securitytracker.com/id/1041852 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-0051?: CVE-2018-0051 is a high-severity vulnerability in Juniper Junos, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-10-10.
How severe is CVE-2018-0051?: High severity. CVSS v3 base score is 7.5 out of 10.