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CVE-2019-0039

Junos OS: Login credentials are vulnerable to brute force attacks through the REST API

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

  1. ID reserved

    By juniper

  2. · 6 months later

    Published

  3. · 5 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2019-0039, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.0Medium5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVDNVD · Modified3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
1.3% · top 29% of all CVEs (11 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Affected products

  • Juniper Networks · Junos OS

    • affected 14.1X53 – < 14.1X53-D49
    • affected 15.1 – < 15.1F6-S12, 15.1R7-S3
    • affected 15.1X49 – < 15.1X49-D160
    • affected 15.1X53 – < 15.1X53-D236, 15.1X53-D495, 15.1X53-D591, 15.1X53-D69
    • affected 16.1 – < 16.1R3-S10, 16.1R4-S12, 16.1R6-S6, 16.1R7-S3
    • affected 16.1X65 – < 16.1X65-D49
    • affected 16.2 – < 16.2R2-S7
    • affected 17.1 – < 17.1R2-S10, 17.1R3
    • affected 17.2 – < 17.2R1-S8, 17.2R3-S1
    • affected 17.3 – < 17.3R3-S2
    • affected 17.4 – < 17.4R1-S6, 17.4R2-S2
    • affected 18.1 – < 18.1R2-S4, 18.1R3-S1
    • affected 18.2 – < 18.2R1-S5
    • affected 18.2X75 – < 18.2X75-D30
    • affected 18.3 – < 18.3R1-S1

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS 14.1X53-D49, 15.1F6-S12, 15.1R7-S3, 15.1X49-D160, 15.1X53-D236, 15.1X53-D495, 15.1X53-D591, 15.1X53-D69, 16.1R3-S10, 16.1R4-S12, 16.1R6-S6, 16.1R7-S3, 16.1X65-D49, 16.2R2-S7, 17.1R2-S10, 17.1R3, 17.2R1-S8, 17.2R3-S1, 17.3R3-S2, 17.4R1-S6, 17.4R2-S2, 18.1R2-S4, 18.1R3-S1, 18.2R1-S5, 18.2X75-D30, 18.3R1-S1, 18.4R1, and all subsequent releases.

Workaround: Setting a connection limit on REST API may help mitigate this issue. set system services rest control connection-limit 100 Use access lists or firewall filters to limit API access to the device only from trusted hosts.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .