CVE-2021-31386

Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS versions 12.3 prior to 12.3R12-S20 Juniper Networks Junos OS versions 15.1 prior to 15.1R7-S11 Juniper Networks Junos OS versions 18.3 prior to 18.3R3-S6 Juniper Networks Junos OS versions 18.4 prior to 18.4R3-S10 Juniper Networks Junos OS versions 19.1 prior to 19.1R3-S7 Juniper Networks Junos OS versions 19.2 prior to 19.2R3-S4 Juniper Networks Junos OS versions 19.3 prior to 19.3R3-S4 Juniper Networks Junos OS versions 19.4 prior to 19.4R3-S6 Juniper Networks Junos OS versions 20.1 prior to 20.1R3-S2 Juniper Networks Junos OS versions 20.2 prior to 20.2R3-S3 Juniper Networks Junos OS versions 20.3 prior to 20.3R3-S1 Juniper Networks Junos OS versions 20.4 prior to 20.4R3 Juniper Networks Junos OS versions 21.1 prior to 21.1R3 Juniper Networks Junos OS versions 21.2 prior to 21.2R2

Description A Protection Mechanism Failure vulnerability in the J-Web HTTP service of Juniper Networks Junos OS allows a remote unauthenticated attacker to perform Person-in-the-Middle (PitM) attacks against the device.

Recommendations For Juniper Networks Junos OS versions 12.3 prior to 12.3R12-S20, update to version 12.3R12-S20 or later. For Juniper Networks Junos OS versions 15.1 prior to 15.1R7-S11, update to version 15.1R7-S11 or later. For Juniper Networks Junos OS versions 18.3 prior to 18.3R3-S6, update to version 18.3R3-S6 or later. For Juniper Networks Junos OS versions 18.4 prior to 18.4R3-S10, update to version 18.4R3-S10 or later. For Juniper Networks Junos OS versions 19.1 prior to 19.1R3-S7, update to version 19.1R3-S7 or later. For Juniper Networks Junos OS versions 19.2 prior to 19.2R3-S4, update to version 19.2R3-S4 or later. For Juniper Networks Junos OS versions 19.3 prior to 19.3R3-S4, update to version 19.3R3-S4 or later. For Juniper Networks Junos OS versions 19.4 prior to 19.4R3-S6, update to version 19.4R3-S6 or later. For Juniper Networks Junos OS versions 20.1 prior to 20.1R3-S2, update to version 20.1R3-S2 or later. For Juniper Networks Junos OS versions 20.2 prior to 20.2R3-S3, update to version 20.2R3-S3 or later. For Juniper Networks Junos OS versions 20.3 prior to 20.3R3-S1, update to version 20.3R3-S1 or later. For Juniper Networks Junos OS versions 20.4 prior to 20.4R3, update to version 20.4R3 or later. For Juniper Networks Junos OS versions 21.1 prior to 21.1R3, update to version 21.1R3 or later. For Juniper Networks Junos OS versions 21.2 prior to 21.2R2, update to version 21.2R2 or later.