CVE-2025-52951 Information

Jul 12, 2025 cve

Description

A Protection Mechanism Failure vulnerability in kernel filter processing of Juniper Networks Junos OS allows an attacker sending IPv6 traffic to an interface to effectively bypass any firewall filtering configured on the interface.

Due to an issue with Junos OS kernel filter processing the ‘payload-protocol’ match is not being supported causing any term containing it to accept all packets without taking any other action. In essence these firewall filter terms were being processed as an ‘accept’ for all traffic on the interface.

This issue affects Junos OS: 

all versions before 21.2R3-S9 
from 21.4 before 21.4R3-S11 
from 22.2 before 22.2R3-S7 
from 22.4 before 22.4R3-S7 
from 23.2 before 23.2R2-S4 
from 23.4 before 23.4R2-S5 
from 24.2 before 24.2R2-S1 
from 24.4 before 24.4R1-S2 24.4R2.

This is a more complete fix for previously published CVE-2024-21607 (JSA75748).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Reference

https://supportportal.juniper.net/JSA100055

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

5.8

CNNVD-202507-1655 (Published: 2025-07-11)

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