VULNERABILITY INTELLIGENCE

CVE-2021-31386

CVSS score5.9 MEDIUM

EPSS probability3.11%

CISA KEVNot currently listed

Published2021-10-19

Last modified2026-06-17

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. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S20; 15.1 versi…