An Information Exposure vulnerability in J-Web of Juniper Networks Junos OS allows an unauthenticated attacker to elevate their privileges over the target system through opportunistic use of an authenticated users session. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S17.

17.3 versions prior to 17.3R3-S10.

17.4 versions prior to 17.4R2-S12, 17.4R3-S3.

18.1 versions prior to 18.1R3-S11.

18.2 versions prior to 18.2R3-S6.

18.3 versions prior to 18.3R2-S4, 18.3R3-S4.

18.4 versions prior to 18.4R2-S5, 18.4R3-S5.

19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3.

19.2 versions prior to 19.2R1-S5, 19.2R3, 19.2R3-S1.

19.3 versions prior to 19.3R2-S4, 19.3R3.

19.4 versions prior to 19.4R1-S3, 19.4R2-S2, 19.4R3.

20.1 versions prior to 20.1R1-S4, 20.1R2.

20.2 versions prior to 20.2R1-S1, 20.2R2.