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Vulnerabilities

CVE-2026-21913

High
An Incorrect Initialization of Resource vulnerability in the Internal Device Manager (IDM) of Juniper Networks Junos OS on EX4000 models allows an unauthenticated, network-based attacker to cause a De
CWE-665 — Weakness Type
Published: Jan 15, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

An Incorrect Initialization of Resource vulnerability in the Internal Device Manager (IDM) of Juniper Networks Junos OS on EX4000 models allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).

On EX4000 models with 48 ports (EX4000-48T, EX4000-48P, EX4000-48MP) a high volume of traffic destined to the device will cause an FXPC crash and restart, which leads to a complete service outage until the device has automatically restarted.




The following reboot reason can be seen in the output of 'show chassis routing-engine' and as a log message:

  reason=0x4000002 reason_string=0x4000002:watchdog + panic with core dump




This issue affects Junos OS on EX4000-48T, EX4000-48P and EX4000-48MP:



* 24.4 versions before 24.4R2,
* 25.2 versions before 25.2R1-S2, 25.2R2.




This issue does not affect versions before 24.4R1 as the first Junos OS version for the EX4000 models was 24.4R1.

🤖

Queued for AI Analysis

This CVE will be auto-analyzed on the next cron run.

📦 Affected Products / CPE 8 entries
juniper:junos:24.4
juniper:junos:24.4
juniper:junos:24.4
juniper:junos:24.4
juniper:junos:25.2
juniper:junos:25.2
juniper:junos:25.2
juniper:junos:25.2
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-665
EPSS0.02%
Exploit No
Patch ✓ Yes
Published 2026-01-15
Source Feed nvd
Views 1
🏷️ Tags
CWE-665
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