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HIGH · 7.5

CVE-2025-30644

A Heap-based Buffer Overflow vulnerability in the flexible PIC concentrator (FPC) of Juniper Networks Junos OS on EX2300, EX3400, EX4100, EX4300, EX4300MP, EX4400, EX4600, EX4650-48Y, and QFX5k Series...

Vulnerability Description

A Heap-based Buffer Overflow vulnerability in the flexible PIC concentrator (FPC) of Juniper Networks Junos OS on EX2300, EX3400, EX4100, EX4300, EX4300MP, EX4400, EX4600, EX4650-48Y, and QFX5k Series allows an attacker to send a specific DHCP packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. Under a rare timing scenario outside the attacker's control, memory corruption may be observed when DHCP Option 82 is enabled, leading to an FPC crash and affecting packet forwarding. Due to the nature of the heap-based overflow, exploitation of this vulnerability could also lead to remote code execution within the FPC, resulting in complete control of the vulnerable component. This issue affects Junos OS on EX2300, EX3400, EX4100, EX4300, EX4300MP, EX4400, EX4600, EX4650-48Y, and QFX5k Series: * All versions before 21.4R3-S9,  * from 22.2 before 22.2R3-S5,  * from 22.4 before 22.4R3-S5,  * from 23.2 before 23.2R2-S3,  * from 23.4 before 23.4R2-S3,  * from 24.2 before 24.2R2.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
JuniperJunos< 21.4
JuniperEx2300-
JuniperEx3400-
JuniperEx4100-
JuniperEx4300-
JuniperEx4300Mp-
JuniperEx4400-
JuniperEx4600-
JuniperEx4650-48Y-
JuniperQfx5110-
JuniperQfx5120-
JuniperQfx5130-
JuniperQfx5200-
JuniperQfx5210-
JuniperQfx5220-
JuniperQfx5230-64Cd-
JuniperQfx5240-
JuniperQfx5241-
JuniperQfx5700-

Related Weaknesses (CWE)

CWE-122

References

FAQ

What is CVE-2025-30644?

CVE-2025-30644 is a vulnerability with a CVSS score of 7.5 (HIGH). A Heap-based Buffer Overflow vulnerability in the flexible PIC concentrator (FPC) of Juniper Networks Junos OS on EX2300, EX3400, EX4100, EX4300, EX4300MP, EX4400, EX4600, EX4650-48Y, and QFX5k Series...

How severe is CVE-2025-30644?

CVE-2025-30644 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-30644?

Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos, Juniper Ex2300, Juniper Ex3400, Juniper Ex4100, Juniper Ex4300.