No exploitation reportedFix available

CVE-2019-0039

Q: Is CVE-2019-0039 actively exploited?

Active exploitation of CVE-2019-0039 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-0039?

CVE-2019-0039 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2019-04-10
Fixed in18.3r1-s1 · 18.2r1-s5 · 18.2x75-d30 · 18.1r2-s4 · 17.4r1-s6 · 17.3r3-s2
WeaknessCWE-307

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

If REST API is enabled, the Junos OS login credentials are vulnerable to brute force attacks. The high default connection limit of the REST API may allow an attacker to brute-force passwords using advanced scripting techniques. Additionally, administrators who do not enforce a strong password policy can increase the likelihood of success from brute force attacks. Affected releases are Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D49; 15.1 versions prior to 15.1F6-S12, 15.1R7-S3; 15.1X49 versions prior to 15.1X49-D160; 15.1X53 versions prior to 15.1X53-D236, 15.1X53-D495, 15.1X53-D591, 15.1X53-D69; 16.1 versions prior to 16.1R3-S10, 16.1R4-S12, 16.1R6-S6, 16.1R7-S3; 16.1X65 versions prior to 16.1X65-D49; 16.2 versions prior to 16.2R2-S7; 17.1 versions prior to 17.1R2-S10, 17.1R3; 17.2 versions prior to 17.2R1-S8, 17.2R3-S1; 17.3 versions prior to 17.3R3-S2; 17.4 versions prior to 17.4R1-S6, 17.4R2-S2; 18.1 versions prior to 18.1R2-S4, 18.1R3-S1; 18.2 versions prior to 18.2R1-S5; 18.2X75 versions prior to 18.2X75-D30; 18.3 versions prior to 18.3R1-S1.

Timeline

dates in UTC

2019-04-1020:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-0039?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-0039?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Juniper junos

Branch	Affected	Fixed in	Source
18.3	≥ 18.3, < 18.3r1-s1	18.3r1-s1	NVD
18.2	≥ 18.2, < 18.2r1-s5	18.2r1-s5	NVD
18.2	≥ 18.2x75, < 18.2x75-d30	18.2x75-d30	NVD
18.1	≥ 18.1, < 18.1r2-s4	18.1r2-s4	NVD
17.4	≥ 17.4, < 17.4r1-s6	17.4r1-s6	NVD
17.3	≥ 17.3, < 17.3r3-s2	17.3r3-s2	NVD
17.2	≥ 17.2, < 17.2r1-s8	17.2r1-s8	NVD
17.1	≥ 17.1, < 17.1r2-s10	17.1r2-s10	NVD
16.2	≥ 16.2, < 16.2r2-s7	16.2r2-s7	NVD
16.1	≥ 16.1, < 16.1r3-s10	16.1r3-s10	NVD
16.1	≥ 16.1x65, < 16.1x65-d49	16.1x65-d49	NVD
15.1	≥ 15.1, < 15.1f6-s12	15.1f6-s12	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Juniper junos to 18.3r1-s1 · 18.2r1-s5 · 18.2x75-d30 · 18.1r2-s4 · 17.4r1-s6 · 17.3r3-s2 · 17.2r1-s8 · 17.1r2-s10

Advisories and patches

kb.juniper.netMitigation · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.18.1read 2026-10-23
CNACVSS 3.05.3read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
CNAweakness (CWE)CWE-307read 2026-10-23
NVDweakness (CWE)CWE-307read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2019-04-10
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-0039?

Is CVE-2019-0039 actively exploited?

Active exploitation of CVE-2019-0039 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-0039?

CVE-2019-0039 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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