---
cve: "CVE-2023-44186"
severity: "HIGH"
cvss: 7.5
epss: "54%"
vendor: "Juniper Networks"
kev: false
exploited: false
published: "2023-10-11 21:15:09"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T21:32:29+02:00"
---

# CVE-2023-44186

> 7.5 HIGH

## Beschreibung

An Improper Handling of Exceptional Conditions vulnerability in AS PATH processing of Juniper Networks Junos OS and Junos OS Evolved allows an attacker to send a BGP update message with an AS PATH containing a large number of 4-byte ASes, leading to a Denial of Service (DoS). Continued receipt and processing of these BGP updates will create a sustained Denial of Service (DoS) condition.

This issue is hit when the router has Non-Stop Routing (NSR) enabled, has a non-4-byte-AS capable BGP neighbor, receives a BGP update message with a prefix that includes a long AS PATH containing large number of 4-byte ASes, and has to advertise the prefix towards the non-4-byte-AS capable BGP neighbor.

Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.
This issue affects:

Juniper Networks Junos OS:



  *  All versions prior to 20.4R3-S8;
  *  21.1 versions 21.1R1 and later;
  *  21.2 versions prior to 21.2R3-S6;
  *  21.3 versions prior to 21.3R3-S5;
  *  21.4 versions prior to 21.4R3-S5;
  *  22.1 versions prior to 22.1R3-S4;
  *  22.2 versions prior to 22.2R3-S2;
  *  22.3 versions prior to 22.3R2-S2, 22.3R3-S1;
  *  22.4 versions prior to 22.4R2-S1, 22.4R3.




Juniper Networks Junos OS Evolved



  *  All versions prior to 20.4R3-S8-EVO;
  *  21.1 versions 21.1R1-EVO and later;
  *  21.2 versions prior to 21.2R3-S6-EVO;
  *  21.3 versions prior to 21.3R3-S5-EVO;
  *  21.4 versions prior to 21.4R3-S5-EVO;
  *  22.1 versions prior to 22.1R3-S4-EVO;
  *  22.2 versions prior to 22.2R3-S2-EVO;
  *  22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO;
  *  22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-EVO.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://supportportal.juniper.net/JSA73150>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-44186) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_