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.

Classification

CVE ID: CVE-2025-30644

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products

Vendor: Juniper Networks

Product: Junos OS

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.3% (scored less or equal to compared to others)

EPSS Date: 2025-05-03 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-30644
https://supportportal.juniper.net/JSA96453

Timeline