CVE-2025-30646

Summary

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 Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS0 < 21.2R3-S9affected
Juniper NetworksJunos OS21.4 < 21.4R3-S10affected
Juniper NetworksJunos OS22.2 < 22.2R3-S6affected
Juniper NetworksJunos OS22.4 < 22.4R3-S6affected
Juniper NetworksJunos OS23.2 < 23.2R2-S3affected
Juniper NetworksJunos OS23.4 < 23.4R2-S4affected
Juniper NetworksJunos OS24.2 < 24.2R2affected
Juniper NetworksJunos OS Evolved0 < 21.4R3-S10-EVOaffected
Juniper NetworksJunos OS Evolved22.2-EVO < 22.2R3-S6-EVOaffected
Juniper NetworksJunos OS Evolved22.4-EVO < 22.4R3-S6-EVOaffected
Juniper NetworksJunos OS Evolved23.2-EVO < 23.2R2-S3-EVOaffected
Juniper NetworksJunos OS Evolved23.4-EVO < 23.4R2-S4-EVOaffected
Juniper NetworksJunos OS Evolved24.2-EVO < 24.2R2-EVOaffected

Weaknesses

  • CWE-195: CWE-195 Signed to Unsigned Conversion Error

Workarounds

There are no known workarounds for this issue.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References