---
title: "CVE-2026-102055: Juniper Networks Junos OS - Buffer Overflow"
description: "Juniper Networks Junos OS on MX Series and Junos OS Evolved on PTX Series platforms contain a stack-based buffer overflow caused by processing a specific CFM message in the cfmd process, letting unauthenticated adjacent-network attackers execute arbitrary code as root or cause denial of service, exploit requires enhanced CFM mode enabled and a configured down-MEP."
url: https://panop.io/threat-heartbeat/CVE-2026-102055/
---

# CVE-2026-102055 Juniper Networks Junos OS - Buffer Overflow

Juniper Networks Junos OS on MX Series and Junos OS Evolved on PTX Series platforms contain a stack-based buffer overflow caused by processing a specific CFM message in the cfmd process, letting unauthenticated adjacent-network attackers execute arbitrary code as root or cause denial of service, exploit requires enhanced CFM mode enabled and a configured down-MEP.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102055)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:A/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 version with the fix applied.

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-2026-102055](https://nvd.nist.gov/vuln/detail/CVE-2026-102055)
- [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

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