CVE-2026-102055

Junos OS and Junos OS Evolved: MX Series, PTX Series: An attacker causes remote code execution and denial of service when enhanced CFM is enabled

View on CVE.org

Published Oct 14, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Description

A Stack-based Buffer Overflow vulnerability in the cfmd process of Juniper Networks Junos OS on MX Series and Junos OS Evolved on PTX Series platforms allows an unauthenticated adjacent-network attacker to execute arbitrary code as root or cause denial of service via a specific CFM Message sent to a configured down-MEP with enhanced CFM mode enabled.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Juniper Networks

Junos OS

unaffected

Version	Status	Constraints
`0`	affected	< 23.2R2-S7.7
`23.4`	affected	< 23.4R2-S8.13
`24.2`	affected	< 24.2R2-S5.5
`24.4`	affected	< 24.4R2-S5
`25.2`	affected	< 25.2R2-S2
`25.4`	affected	< 25.4R1-S3
`26.2`	affected	< 26.2R1-S2

Juniper Networks

Junos OS Evolved

unaffected

Version	Status	Constraints
`0`	affected	< 23.2R2-S7.7-EVO
`23.4`	affected	< 23.4R2-S8.11-EVO
`24.2`	affected	< 24.2R2-S5.6-EVO
`24.4`	affected	< 24.4R2-S5-EVO
`25.2`	affected	< 25.2R2-S2-EVO
`25.4`	affected	< 25.4R1-S3-EVO
`26.2`	affected	< 26.2R1-S2-EVO
`23.4X100`	affected	—
`25.2X100`	affected	< 25.2X100-D35-EVO
`25.4X300`	affected	< 25.4X300-D40-EVO

No data.

Vendor Product Versions

Juniper Networks

Junos Os

Version	Status	Scheme	Platform
`[0,23.2R2-S7.7)`	affected	generic	['mx_series']
`[23.4,23.4R2-S8.13)`	affected	generic	['mx_series']
`[24.2,24.2R2-S5.5)`	affected	generic	['mx_series']
`[24.4,24.4R2-S5)`	affected	generic	['mx_series']
`[25.2,25.2R2-S2)`	affected	generic	['mx_series']
`[25.4,25.4R1-S3)`	affected	generic	['mx_series']
`[26.2,26.2R1-S2)`	affected	generic	['mx_series']

Juniper Networks

Junos Os Evolved

Version	Status	Scheme	Platform
`[0,23.2R2-S7.7-EVO)`	affected	generic	['ptx_series']
`[23.4,23.4R2-S8.11-EVO)`	affected	generic	['ptx_series']
`[24.2,24.2R2-S5.6-EVO)`	affected	generic	['ptx_series']
`[24.4,24.4R2-S5-EVO)`	affected	generic	['ptx_series']
`[25.2,25.2R2-S2-EVO)`	affected	generic	['ptx_series']
`[25.4,25.4R1-S3-EVO)`	affected	generic	['ptx_series']
`[26.2,26.2R1-S2-EVO)`	affected	generic	['ptx_series']
`23.4X100`	affected	generic	['ptx_series']
`[25.2X100,25.2X100-D35-EVO)`	affected	generic	['ptx_series']
`[25.4X300,25.4X300-D40-EVO)`	affected	generic	['ptx_series']

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, and all subsequent releases. Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO, and all subsequent releases. Note: For Junos OS releases 23.2, 23.4, and 24.2, and Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

Vendor Workaround

There are no known workarounds for this issue.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact Low

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.325% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://supportportal.juniper.net/JSA112187

History

Oct 17, 2026 12:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Juniper Networks Juniper Networks junos Os Juniper Networks junos Os Evolved
Vendors & Products		Juniper Networks Juniper Networks junos Os Juniper Networks junos Os Evolved

Oct 16, 2026 3:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Oct 14, 2026 5:00 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A Stack-based Buffer Overflow vulnerability in the cfmd process of Juniper Networks Junos OS on MX Series and Junos OS Evolved on PTX Series platforms allows an unauthenticated adjacent-network attacker to execute arbitrary code as root or cause denial of service via a specific CFM Message sent to a configured down-MEP with enhanced CFM mode enabled.
Title		Junos OS and Junos OS Evolved: MX Series, PTX Series: An attacker causes remote code execution and denial of service when enhanced CFM is enabled
Weaknesses		CWE-121
References		https://supportportal.juniper.net/JSA112187
Metrics		cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}` cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M'}`