CVE-2021-31386

Summary

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. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S20; 15.1 versions prior to 15.1R7-S11; 18.3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R3-S10; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R3-S4; 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R3-S6; 20.1 versions prior to 20.1R3-S2; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS12.3 < 12.3R12-S20affected
Juniper NetworksJunos OS15.1 < 15.1R7-S11affected
Juniper NetworksJunos OS18.3 < 18.3R3-S6affected
Juniper NetworksJunos OS18.4 < 18.4R3-S10affected
Juniper NetworksJunos OS19.1 < 19.1R3-S7affected
Juniper NetworksJunos OS19.2 < 19.2R3-S4affected
Juniper NetworksJunos OS19.3 < 19.3R3-S4affected
Juniper NetworksJunos OS19.4 < 19.4R3-S6affected
Juniper NetworksJunos OS20.1 < 20.1R3-S2affected
Juniper NetworksJunos OS20.2 < 20.2R3-S3affected
Juniper NetworksJunos OS20.3 < 20.3R3-S1affected
Juniper NetworksJunos OS20.4 < 20.4R3affected
Juniper NetworksJunos OS21.1 < 21.1R3affected
Juniper NetworksJunos OS21.2 < 21.2R2affected

Weaknesses

  • CWE-311: CWE-311: Missing Encryption of Sensitive Data
  • CWE-325: CWE-325: Missing Cryptographic Step
  • CWE-693: CWE-693: Protection Mechanism Failure
  • CWE-300: CWE-300 Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Workarounds

Discontinue the use of HTTP, instead use HTTPS when using J-Web.

[system services web-management https]

ADP Enrichment

CVE Program Container

Additional References

References