What is the CVSS score of CVE-2025-21399?

CVE-2025-21399 has a CVSS 3.1 base score of 7.4 (High). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Is there a public PoC exploit available for CVE-2025-21399?

Yes, a public proof-of-concept exploit is available for CVE-2025-21399. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2025-21399?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Chrome CVE-2025-21399

HIGH

Untrusted Search Path (CWE-426)

2025-01-17 secure@microsoft.com

Information Disclosure Chrome Google Microsoft Edge Update

7.4

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-426 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V13 - Configuration Search path verification
Impact	CVSS score of 7.4 (HIGH). Attack characteristics: local attack vector, high complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.19%.
Exploit ScenarioDerived	Successful exploitation could compromise the high-severity affected system.

This Month Plan within 30 days. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.2% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 28, 2026

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability. Rated high severity (CVSS 7.4), this vulnerability is no authentication required. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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

Technical ContextAI · show details

This vulnerability is classified under CWE-426. Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability Affected products include: Microsoft Edge Update.

Know when Chrome gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.4 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Jul 03, 2025 - 11:22 vuln.today

Public exploit code

CVE Published

Jan 17, 2025 - 20:15 nvd

HIGH 7.4

DescriptionCVE.org

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Executive ViewAI

Why It Matters

CVE-2025-21399 presents moderate security risk rated CVSS 7.4. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available, increasing the risk of exploitation. Organizations should apply vendor updates when available and consider compensating controls in the interim.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score

0.2%

Top 59% exploitable

Exploit

POC

Public exploit code exists

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 Yes

EPSS 0.2%

Patch available No

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

Exploitation· derived

Poc

System Exposure· derived

Small

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +37

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.