CVE-2025-21602

Summary

An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a specific BGP update packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS).

Continuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.

This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.

This issue affects Junos OS: 

  • from 21.4 before 21.4R3-S9, 
  • from 22.2 before 22.2R3-S5, 
  • from 22.3 before 22.3R3-S4,
  • from 22.4 before 22.4R3-S5, 
  • from 23.2 before 23.2R2-S3, 
  • from 23.4 before 23.4R2-S3, 
  • from 24.2 before 24.2R1-S2, 24.2R2; 

This issue does not affect versions prior to 21.1R1.

Junos OS Evolved: 

  • from 21.4 before 21.4R3-S9-EVO, 
  • from 22.2 before 22.2R3-S5-EVO, 
  • from 22.3 before 22.3R3-S4-EVO,
  • from 22.4 before 22.4R3-S5-EVO, 
  • from 23.2 before 23.2R2-S3-EVO, 
  • from 23.4 before 23.4R2-S3-EVO, 
  • from 24.2 before 24.2R1-S2-EVO, 24.2R2-EVO.

This issue does not affect versions prior to 21.1R1-EVO

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS21.4 < 21.4R3-S9affected
Juniper NetworksJunos OS22.2 < 22.2R3-S5affected
Juniper NetworksJunos OS22.3 < 22.3R3-S4affected
Juniper NetworksJunos OS22.4 < 22.4R3-S5affected
Juniper NetworksJunos OS23.2 < 23.2R2-S3affected
Juniper NetworksJunos OS23.4 < 23.4R2-S3affected
Juniper NetworksJunos OS24.2 < 24.2R1-S2, 24.2R2affected
Juniper NetworksJunos OS0 < 21.3R1unaffected
Juniper NetworksJunos OS Evolved21.4 < 21.4R3-S9-EVOaffected
Juniper NetworksJunos OS Evolved22.2 < 22.2R3-S5-EVOaffected
Juniper NetworksJunos OS Evolved22.3 < 22.3R3-S4-EVOaffected
Juniper NetworksJunos OS Evolved22.4 < 22.4R3-S5-EVOaffected
Juniper NetworksJunos OS Evolved23.2 < 23.2R2-S3-EVOaffected
Juniper NetworksJunos OS Evolved23.4 < 23.4R2-S3-EVOaffected
Juniper NetworksJunos OS Evolved24.2 < 24.2R1-S2-EVO, 24.2R2-EVOaffected
Juniper NetworksJunos OS Evolved0 < 21.3R1-EVOunaffected

Weaknesses

  • CWE-755: CWE-755 Improper Handling of Exceptional Conditions

Workarounds

There are no known workarounds for this issue.

ADP Enrichment

CISA ADP Vulnrichment

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

References