What is the CVSS score of CVE-2025-30359?

CVE-2025-30359 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.2%.

Is there a public PoC exploit available for CVE-2025-30359?

Yes, a public proof-of-concept exploit is available for CVE-2025-30359. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2025-30359?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Webpack Dev Server CVE-2025-30359

Q: Which versions of Webpack Dev Server are affected by CVE-2025-30359?

Organizations using webpack-dev-server should be aware of moderate risk from CVE-2025-30359 rated CVSS 5.3. Exploitation could compromise the security of affected deployments.. A patch is available.

EUVD-2025-16767 MEDIUM

Exposed Dangerous Method or Function (CWE-749)

2025-06-03 security-advisories@github.com

GHSA-4v9v-hfq4-rm2v

Code Injection Red Hat Webpack Dev Server Webpack Js

5.3

CVSS 3.1 · GitHub Advisory

View

Vulnerability Assessment

Weakness	CWE CWE-749 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Dangerous method exposure prevention
Impact	CVSS 5.3. EPSS 0.2%. Public PoC/exploit available. Vendor patch available.
Exploit ScenarioDerived	An attacker could send a specially crafted request to webpack-dev-server to execute arbitrary code on the underlying server, potentially gaining full control of the system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 14, 2026

A remote code execution vulnerability in webpack-dev-server (CVSS 5.3) that allows users. Risk factors: public PoC available. Vendor patch is available.

Earlier versions of this analysis (1)

v1 Mar 14, 2026 - 17:04 CVSS 5.3

RemediationAI

Apply the vendor-supplied patch immediately.

Affected VersionsENISA

webpack-dev-server < 5.2.1

Affected Packages

npm webpack-dev-server fix: 5.2.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

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

Technical ContextAI · show details

Vulnerability type: remote code execution. Affects webpack-dev-server.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 5.3 MEDIUM

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

Red Hat 5.3 MEDIUM

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Mar 14, 2026 - 17:04 nvd

Patch available

PoC Detected

Oct 03, 2025 - 01:12 vuln.today

Public exploit code

CVE Published

Jun 03, 2025 - 18:15 nvd

MEDIUM 5.3

DescriptionGitHub Advisory

webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when they access a malicious web site. Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject a malicious script in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. Combined with prototype pollution, the attacker can get a reference to the webpack runtime variables. By using Function::toString against the values in __webpack_modules__, the attacker can get the source code. Version 5.2.1 contains a patch for the issue.

Executive ViewAI

Why It Matters

Organizations using webpack-dev-server should be aware of moderate risk from CVE-2025-30359 rated CVSS 5.3. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.2%

Top 64% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS Vendor

GitHub

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 MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +26

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.