---
title: "CVE-2026-33789: Juniper Networks Junos OS - Buffer Overflow"
description: "Juniper Networks Junos OS and Junos OS Evolved contain a stack-based buffer overflow caused by crafted BGP route updates in the routing protocol daemon (rpd) when BGP Monitoring Protocol (BMP) is enabled, letting unauthenticated BGP peers cause denial of service and potential root-level command execution, exploit requires BMP enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-33789/
---

# CVE-2026-33789 Juniper Networks Junos OS - Buffer Overflow

Juniper Networks Junos OS and Junos OS Evolved contain a stack-based buffer overflow caused by crafted BGP route updates in the routing protocol daemon (rpd) when BGP Monitoring Protocol (BMP) is enabled, letting unauthenticated BGP peers cause denial of service and potential root-level command execution, exploit requires BMP enabled.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-33789)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Remote Code Execution

CVSS vector

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

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest Junos OS and Junos OS Evolved versions with the BMP buffer overflow fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-33789](https://nvd.nist.gov/vuln/detail/CVE-2026-33789)
- [https://supportportal.juniper.net/JSA112187](https://supportportal.juniper.net/JSA112187)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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