Question: What is CVE-2025-21600?
Answer: CVE-2025-21600 is a vulnerability classified as high with a CVSS score of 7.1. It falls under CWE-125 and affects the system as follows: An Out-of-Bounds Read vulnerability in

the routing protocol daemon (rpd) of 

 Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.



This issue only affects systems configured in
      either of two ways:

    
    
        *  systems with BGP traceoptions enabled

        *  systems with BGP family traffic-engineering (BGP-LS)
          configured


 and can be exploited from a directly connected and configured BGP peer. 

This issue affects iBGP and eBGP 

with 

any address family

 configured, 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; 




Junos OS Evolved: 



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


This issue does not affect versions of Junos OS prior to 21.3R1.


This issue does not affect versions of Junos OS Evolved prior to 21.3R1-EVO.



This is a similar, but different vulnerability than the issue reported as CVE-2024-39516.