title: 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.
problem types: CWE-307 Improper Restriction of Excessive Authentication Attempts
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 14.1X53-D49, status: affected, version: 14.1X53, versionType: custom
lessThan: 15.1F6-S12, 15.1R7-S3, status: affected, version: 15.1, versionType: custom
lessThan: 15.1X49-D160, status: affected, version: 15.1X49, versionType: custom
lessThan: 15.1X53-D236, 15.1X53-D495, 15.1X53-D591, 15.1X53-D69, status: affected, version: 15.1X53, versionType: custom
lessThan: 16.1R3-S10, 16.1R4-S12, 16.1R6-S6, 16.1R7-S3, status: affected, version: 16.1, versionType: custom
lessThan: 16.1X65-D49, status: affected, version: 16.1X65, versionType: custom
lessThan: 16.2R2-S7, status: affected, version: 16.2, versionType: custom
lessThan: 17.1R2-S10, 17.1R3, status: affected, version: 17.1, versionType: custom
lessThan: 17.2R1-S8, 17.2R3-S1, status: affected, version: 17.2, versionType: custom
lessThan: 17.3R3-S2, status: affected, version: 17.3, versionType: custom
lessThan: 17.4R1-S6, 17.4R2-S2, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R2-S4, 18.1R3-S1, status: affected, version: 18.1, versionType: custom
lessThan: 18.2R1-S5, status: affected, version: 18.2, versionType: custom
lessThan: 18.2X75-D30, status: affected, version: 18.2X75, versionType: custom
lessThan: 18.3R1-S1, status: affected, version: 18.3, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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: 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.
workarounds: 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.