What is CVE-2025-30644?

CVE-2025-30644 is a high-severity vulnerability in Juniper Ex2300, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-04-09.

How severe is CVE-2025-30644?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Juniper Ex2300

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 allows an attacker to send a specific…

Vulnerability class: Buffer Overflow

EPSS: 0.003 (16.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Juniper Ex2300
Juniper Ex3400
Juniper Ex4100
Juniper Ex4300
Juniper Ex4300mp
Juniper Ex4400
Juniper Ex4600
Juniper Ex4650-48y
Juniper Junos — versions 21.4, 22.2, 22.4
Juniper Qfx5110

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

sirt@juniper.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-30644?: CVE-2025-30644 is a high-severity vulnerability in Juniper Ex2300, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-04-09.
How severe is CVE-2025-30644?: High severity. CVSS v3 base score is 7.5 out of 10.