# CVE-2024-39552

## Summary

- **CVE ID:** CVE-2024-39552
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:A)
- **CWE:** CWE-755
- **Published:** Jul 11, 2024
- **Last Modified:** Mar 13, 2026

## Description

An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows a network based, unauthenticated attacker to cause the RPD process to crash leading to a Denial of Service (DoS).

When a malformed BGP UPDATE packet is received over an established BGP session, RPD crashes and restarts.

Continuous receipt of the malformed BGP UPDATE messages will create a sustained Denial of Service (DoS) condition for impacted devices.

This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations.  This issue requires a remote attacker to have at least one established BGP session.

This issue affects:
 
Juniper Networks Junos OS:
  *  All versions earlier than 20.4R3-S9;
  *  21.2 versions earlier than 21.2R3-S7;
  *  21.3 versions earlier than 21.3R3-S5;
  *  21.4 versions earlier than 21.4R3-S6;
  *  22.1 versions earlier than 22.1R3-S4;
  *  22.2 versions earlier than 22.2R3-S3;
  *  22.3 versions earlier than 22.3R3-S2;
  *  22.4 versions earlier than 22.4R3;
  *  23.2 versions earlier than 23.2R2.



Juniper Networks Junos OS Evolved:
  *  All versions earlier than 21.2R3-S7;
  *  21.3-EVO versions earlier than 21.3R3-S5;
  *  21.4-EVO versions earlier than 21.4R3-S8;
  *  22.1-EVO versions earlier than 22.1R3-S4;
  *  22.2-EVO versions earlier than 22.2R3-S3;
  *  22.3-EVO versions earlier than 22.3R3-S2;
  *  22.4-EVO versions earlier than 22.4R3;
  *  23.2-EVO versions earlier than 23.2R2.

## Affected Products

- Juniper Networks — Junos OS (0)
- Juniper Networks — Junos OS (21.2)
- Juniper Networks — Junos OS (21.3)
- Juniper Networks — Junos OS (21.4)
- Juniper Networks — Junos OS (22.1)
- 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 Evolved (0)
- Juniper Networks — Junos OS Evolved (21.3-EVO)
- Juniper Networks — Junos OS Evolved (21.4-EVO)
- Juniper Networks — Junos OS Evolved (22.1-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/JSA75726)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.59%
- **EPSS Percentile:** 46.4

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