CVE-2026-102059

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

State: Published
Severity: 8.7 High
Published: Oct 14, 2026
Updated: Oct 16, 2026
Reserved: Sep 28, 2026

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Description

An 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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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/V:C/RE:M	juniper
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	juniper

Weaknesses

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

Affected Products

Product	Versions
Junos OSJuniper Networks	before 23.2R2-S7.7Affected 23.4 to before 23.4R2-S8.13Affected 24.2 to before 24.2R2-S5.5Affected 24.4 to before 24.4R2-S5Affected 25.2 to before 25.2R2-S2Affected 25.4 to before 25.4R1-S3Affected 26.2 to before 26.2R1-S2Affected
Junos OS EvolvedJuniper Networks	before 23.2R2-S7.7-EVOAffected 23.4 to before 23.4R2-S8.11-EVOAffected 24.2 to before 24.2R2-S5.6-EVOAffected 24.4 to before 24.4R2-S5-EVOAffected 25.2 to before 25.2R2-S2-EVOAffected 25.4 to before 25.4R1-S3-EVOAffected 26.2 to before 26.2R1-S2-EVOAffected 23.4X100Affected 25.2X100 to before 25.2X100-D35-EVOAffected 25.4X300 to before 25.4X300-D40-EVOAffected

References

https://supportportal.juniper.net/JSA112187vendor-advisory

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