# CVE-2025-21593

## Summary

- **CVE ID:** CVE-2025-21593
- **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:N/R:A)
- **CWE:** CWE-664
- **Published:** Jan 9, 2025
- **Last Modified:** Mar 12, 2026

## Description

An Improper Control of a Resource Through its Lifetime vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker to cause a Denial-of-Service (DoS).

On devices with SRv6 (Segment Routing over IPv6) enabled, an attacker can send a malformed BGP UPDATE packet which will cause the rpd to crash and restart. Continued receipt of these UPDATE packets will cause a sustained DoS condition. 

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



  *  All versions before 21.2R3-S9, 
  *  from 21.4 before 21.4R3-S10, 
  *  from 22.2 before 22.2R3-S5, 
  *  from 22.3 before 22.3R3-S4, 
  *  from 22.4 before 22.4R3-S3, 
  *  from 23.2 before 23.2R2-S2, 
  *  from 23.4 before 23.4R2;



and Junos OS Evolved: 



  *  All versions before 21.2R3-S9-EVO, 
  *  from 21.4-EVO before 21.4R3-S10-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-S3-EVO,
  *  from 23.2-EVO before 23.2R2-S2-EVO, 
  *  from 23.4-EVO before 23.4R2-EVO.

## Affected Products

- Juniper Networks — Junos OS (0)
- Juniper Networks — Junos OS (21.4)
- Juniper Networks — Junos OS (22.2)
- Juniper Networks — Junos OS (22.3)
- Juniper Networks — Junos OS (22.4)
- Juniper Networks — Junos OS (23.2)
- Juniper Networks — Junos OS (23.4)
- Juniper Networks — Junos OS Evolved (0)
- Juniper Networks — Junos OS Evolved (21.4-EVO)
- Juniper Networks — Junos OS Evolved (22.2-EVO)
- Juniper Networks — Junos OS Evolved (22.3-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)

## References

- [CNA](https://supportportal.juniper.net/JSA92861)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 14.6

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