What is the CVSS score of CVE-2025-30661?

CVE-2025-30661 has a CVSS 3.1 base score of 7.3 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2025-30661?

Within 24 hours: Identify all Juniper Junos OS deployments in your environment and document current versions. Within 7 days: Test vendor-released patch in a non-production environment and validate line card functionality post-update. Within 30 days: Deploy patch to all production Junos OS systems in a staged manner according to your change management process, prioritizing internet-facing and critical infrastructure devices.

Junos CVE-2025-30661

Q: Which versions of Junos are affected by CVE-2025-30661?

CVE-2025-30661 is a high-severity remote code execution vulnerability in Juniper Networks Junos OS that could allow local attackers to execute arbitrary code on line card systems.. A patch is available.

EUVD-2025-21165 HIGH

Incorrect Permission Assignment for Critical Resource (CWE-732)

2025-07-11 sirt@juniper.net

Privilege Escalation Juniper Junos

7.3

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-732 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V13 - Configuration Permission assignment review
Impact	CVSS 7.3. EPSS 0.0%. No patch confirmed.
Exploit ScenarioDerived	An attacker could exploit this vulnerability in line card script processing of Juniper Networks Junos OS allows a local to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

A remote code execution vulnerability in line card script processing of Juniper Networks Junos OS allows a local (CVSS 7.3). High severity vulnerability requiring prompt remediation.

Earlier versions of this analysis (1)

v1 Mar 16, 2026 - 08:17 CVSS 7.3

An Incorrect Permission Assignment for Critical Resource vulnerability in line card script processing of Juniper Networks Junos OS allows a local, low-privileged user to install scripts to be executed

RemediationAI

Monitor vendor channels for patch availability.

Affected VersionsENISA

Junos OS 23.4 <23.4R2-S5

Junos OS 24.4 <24.4R1-S3, 24.4R2

Junos OS 24.2 <24.2R2-S1

Junos OS 23.2 <23.2R2-S4

Affected Packages

euvd junos_os fix: 23.2R2-S4, 23.4R2-S5, 24.2R2-S1

euvd junos_os_24_4_24_4r1_s3 no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-732 (Incorrect Permissions). CVSS 7.3 indicates high severity. Affects line card script processing of Juniper Networks Junos OS allows a local.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.3 HIGH

AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

23.4R2-S5,24.4R1-S3,24.2R2-S1

CVE Published

Jul 11, 2025 - 15:15 nvd

HIGH 7.3

DescriptionCVE.org

A local user with access to the local file system can copy a script to the router in a way that will be executed as root, as the system boots. Execution of the script as root can lead to privilege escalation, potentially providing the adversary complete control of the system.

This issue only affects specific line cards, such as the MPC10, MPC11, LC4800, LC9600, MX304-LMIC16, SRX4700, and EX9200-15C.

This issue affects Junos OS: * from 23.2 before 23.2R2-S4,

from 23.4 before 23.4R2-S5,
from 24.2 before 24.2R2-S1,
from 24.4 before 24.4R1-S3, 24.4R2.

This issue does not affect versions prior to 23.1R2.

Executive ViewAI

Why It Matters

CVE-2025-30661 is a high-severity remote code execution vulnerability in Juniper Networks Junos OS that could allow local attackers to execute arbitrary code on line card systems. Organizations running affected Junos OS versions face potential compromise of network infrastructure with elevated privileges, requiring immediate patching to prevent unauthorized system access and network disruption.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.0%

Top 97% exploitable

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +36

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.