CVE-2026-21913

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://kb.juniper.net/JSA106014	Vendor Advisory
https://supportportal.juniper.net/JSA106014	Vendor Advisory

Configurations

Configuration 1 (hide)

AND

OR	cpe:2.3:o:juniper:junos:24.4:-::::::
	cpe:2.3:o:juniper:junos:24.4:r1::::::
	cpe:2.3:o:juniper:junos:24.4:r1-s2::::::
	cpe:2.3:o:juniper:junos:24.4:r1-s3::::::
	cpe:2.3:o:juniper:junos:25.2:-::::::
	cpe:2.3:o:juniper:junos:25.2:r1::::::
	cpe:2.3:o:juniper:junos:25.2:r1-s1::::::
	cpe:2.3:o:juniper:junos:25.2:r2::::::

OR	cpe:2.3:h:juniper:ex4000-48mp:-:::::::*
	cpe:2.3:h:juniper:ex4000-48p:-:::::::*
	cpe:2.3:h:juniper:ex4000-48t:-:::::::*

History

No history.

Information

Published : 2026-01-15 21:16

Updated : 2026-01-23 19:40

NVD link : CVE-2026-21913

Mitre link : CVE-2026-21913

CVE.ORG link : CVE-2026-21913

JSON object : View

Products Affected

juniper

ex4000-48p
ex4000-48mp
junos
ex4000-48t

CWE

CWE-665

Improper Initialization

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