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7.1

Juniper Networks Junos OS and Junos OS Evolved: BGP Update Packet Causes Crash

CVE-2025-21602 · published 1 year ago
Summary

An attacker on the same network as your router can send a specific packet that crashes the Junos OS or Junos OS Evolved routing system, causing your network to become unavailable. This could happen repeatedly, making your network unreliable. To fix this issue, update your Junos OS or Junos OS Evolved to a version released after the ones listed as vulnerable.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
juniper junos 21.2
21.4
22.2
22.3
22.4
23.2
23.4
24.2
cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
juniper junos_os_evolved 21.2
21.4
22.2
22.3
22.4
23.2
23.4
24.2
cpe:2.3:o:juniper:junos_os_evolved:21.2:-:*:*:*:*:*:*
Original advisory text
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 sendi...
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
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
7.1 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-755Improper Handling of Exceptional Conditions
Timeline
Published9 Jan 2025
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2025-21602 · NVD
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