PT-2026-3127 · Juniper Networks · Ex4000-48T+3

Published

2026-01-15

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Updated

2026-01-16

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CVE-2026-21913

CVSS v3.1

7.5

High

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS on EX4000-48T, EX4000-48P and EX4000-48MP versions prior to 24.4R2 Juniper Networks Junos OS on EX4000-48T, EX4000-48P and EX4000-48MP versions prior to 25.2R1-S2 Juniper Networks Junos OS on EX4000-48T, EX4000-48P and EX4000-48MP version 25.2R2
Description An incorrect initialization of resource issue in the Internal Device Manager (IDM) of Juniper Networks Junos OS on EX4000 models can allow an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). A high volume of traffic directed to the device can lead to an FXPC crash and restart, resulting in a complete service outage until the device automatically restarts. The reboot reason can be observed in the output of 'show chassis routing-engine' and as a log message, specifically: 'reason=0x4000002 reason string=0x4000002:watchdog + panic with core dump'.
Recommendations Juniper Networks Junos OS on EX4000-48T, EX4000-48P and EX4000-48MP versions prior to 24.4R2 should be upgraded to version 24.4R2 or later. Juniper Networks Junos OS on EX4000-48T, EX4000-48P and EX4000-48MP versions prior to 25.2R1-S2 should be upgraded to version 25.2R1-S2 or later. Juniper Networks Junos OS on EX4000-48T, EX4000-48P and EX4000-48MP version 25.2R2 is the fixed version.

Fix

Improper Initialization

Weakness Enumeration

CWE-665CWE-1419

Related Identifiers

CVE-2026-21913

Affected Products

Ex4000-48Mp
Ex4000-48P
Ex4000-48T
Junos