Junos OS and Junos OS Evolved: EX Series, SRX Series, QFX Series: A rogue DHCP server causes root-level command execution when the phone-home client processes specific information

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102059
StatePUBLISHED
Assignerjuniper
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 17:18:01 UTC
Updated2026-10-16 15:17:01 UTC
DescriptionAn Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in the phone-home daemon (phcd) of Juniper Networks Junos OS and Junos OS Evolved on EX Series, SRX Series, and QFX Series allows an adjacent unauthenticated attacker to execute arbitrary commands with root privileges via a rogue DHCP server.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:X

Problem Types: CWE-78 | CWE-78 CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/C...
4.0CNACVSS8.7HIGHCVSS: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/...
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
Low

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:X

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Juniper Networks Junos OS affected 23.2R2-S7.7 custom EX Series, SRX Series, QFX Series
CNA Juniper Networks Junos OS affected 23.4 23.4R2-S8.13 custom EX Series, SRX Series, QFX Series
CNA Juniper Networks Junos OS affected 24.2 24.2R2-S5.5 custom EX Series, SRX Series, QFX Series
CNA Juniper Networks Junos OS affected 24.4 24.4R2-S5 custom EX Series, SRX Series, QFX Series
CNA Juniper Networks Junos OS affected 25.2 25.2R2-S2 custom EX Series, SRX Series, QFX Series
CNA Juniper Networks Junos OS affected 25.4 25.4R1-S3 custom EX Series, SRX Series, QFX Series
CNA Juniper Networks Junos OS affected 26.2 26.2R1-S2 custom EX Series, SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 23.2R2-S7.7-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 23.4 23.4R2-S8.11-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 24.2 24.2R2-S5.6-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 24.4 24.4R2-S5-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 25.2 25.2R2-S2-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 25.4 25.4R1-S3-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 26.2 26.2R1-S2-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 23.4X100 custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 25.2X100 25.2X100-D35-EVO custom SRX Series, QFX Series
CNA Juniper Networks Junos OS Evolved affected 25.4X300 25.4X300-D40-EVO custom SRX Series, QFX Series

References

ReferenceSourceLinkTags
supportportal.juniper.net/JSA112187 [email protected] supportportal.juniper.net
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: 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.

Workarounds

CNA: There are no known workarounds for this issue.

Exploits

CNA: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

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