CVE-2025-30661

Root privilege escalation via boot-time script execution

Published Jul 11, 2025 · Updated Feb 26, 2026

Incorrect permission assignment in Junos OS line-card script processing allows local users to execute attacker-supplied scripts as root. The processor accepts a script copied through local filesystem access and executes it with root privileges when the affected line card boots. Exploitation requires low-privileged local filesystem access and specified line-card hardware, and successful execution grants complete system control.

CVSS severity8.5
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect permission assignment in Junos OS line-card script processing allows local users to execute attacker-supplied scripts as root. The processor accepts a script copied through local filesystem access and executes it with root privileges when the affected line card boots. Exploitation requires low-privileged local filesystem access and specified line-card hardware, and successful execution grants complete system control.

The record

CVE
CVE-2025-30661
Published
Jul 11, 2025
Updated
Feb 26, 2026
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-732, CWE-250, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=23.2 <23.2R2-S4
  2. Affected versionversion=23.4 <23.4R2-S5
  3. Affected versionversion=24.2 <24.2R2-S1
  4. Affected versionversion=24.4 <24.4R1-S3, 24.4R2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OSversion=23.2 <23.2R2-S4; version=23.4 <23.4R2-S5; version=24.2 <24.2R2-S1; version=24.4 <24.4R1-S3, 24.4R2

Published CVSS scores

7.3Juniper NetworksCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
8.5Juniper NetworksCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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:N/R:U/V:X/RE:M/U:Amber

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
CWE-250Execution with Unnecessary Privileges
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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