CVE-2025-30646 Information

Description

A Signed to Unsigned Conversion Error vulnerability in the Layer 2 Control Protocol daemon (l2cpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated adjacent attacker sending a specifically malformed LLDP TLV to cause the l2cpd process to crash and restart causing a Denial of Service (DoS).  Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.

When an LLDP telemetry subscription is active receipt of a specifically malformed LLDP TLV causes the l2cpd process to crash and restart.

This issue affects:

Junos OS:

All versions before 21.2R3-S9 
from 21.4 before 21.4R3-S10 
from 22.2 before 22.2R3-S6 
from 22.4 before 22.4R3-S6 
from 23.2 before 23.2R2-S3 
from 23.4 before 23.4R2-S4 
from 24.2 before 24.2R2; 

Junos OS Evolved: 

All versions before 21.4R3-S10-EVO
from 22.2-EVO before 22.2R3-S6-EVO 
from 22.4-EVO before 22.4R3-S6-EVO 
from 23.2-EVO before 23.2R2-S3-EVO 
from 23.4-EVO before 23.4R2-S4-EVO 
from 24.2-EVO before 24.2R2-EVO.

CVSS Vector

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

Reference

https://supportportal.juniper.net/JSA96456

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5