CVE-2025-30644
Severity CVSS v4.0:
HIGH
Type:
CWE-122
Heap-based Buffer Overflow
Publication date:
09/04/2025
Last modified:
11/04/2025
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.<br />
<br />
Under a rare timing scenario outside the attacker&#39;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.<br />
This issue affects Junos OS on EX2300, EX3400, EX4100, EX4300, EX4300MP, EX4400, EX4600, EX4650-48Y, and QFX5k Series: <br />
<br />
<br />
<br />
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* All versions before 21.4R3-S9, <br />
* from 22.2 before 22.2R3-S5, <br />
* from 22.4 before 22.4R3-S5, <br />
* from 23.2 before 23.2R2-S3, <br />
* from 23.4 before 23.4R2-S3, <br />
* from 24.2 before 24.2R2.
Impact
Base Score 4.0
7.70
Severity 4.0
HIGH
Base Score 3.x
7.50
Severity 3.x
HIGH