# CVE-2025-30646

## Summary

- **CVE ID:** CVE-2025-30646
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M)
- **CWE:** CWE-195
- **Published:** Apr 9, 2025
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- Juniper Networks — Junos OS (0)
- Juniper Networks — Junos OS (21.4)
- Juniper Networks — Junos OS (22.2)
- Juniper Networks — Junos OS (22.4)
- Juniper Networks — Junos OS (23.2)
- Juniper Networks — Junos OS (23.4)
- Juniper Networks — Junos OS (24.2)
- Juniper Networks — Junos OS Evolved (0)
- Juniper Networks — Junos OS Evolved (22.2-EVO)
- Juniper Networks — Junos OS Evolved (22.4-EVO)
- Juniper Networks — Junos OS Evolved (23.2-EVO)
- Juniper Networks — Junos OS Evolved (23.4-EVO)
- Juniper Networks — Junos OS Evolved (24.2-EVO)

## References

- [CNA](https://supportportal.juniper.net/JSA96456)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 15.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._