CVE-2021-3038

Description

A denial-of-service (DoS) vulnerability in Palo Alto Networks GlobalProtect app on Windows systems allows a limited Windows user to send specifically-crafted input to the GlobalProtect app that results in a Windows blue screen of death (BSOD) error.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2021-3038 on 2026-06-30. Shown when MITRE's text differs from the cvelistV5 mirror.

A denial-of-service (DoS) vulnerability in Palo Alto Networks GlobalProtect app on Windows systems allows a limited Windows user to send specifically-crafted input to the GlobalProtect app that results in a Windows blue screen of death (BSOD) error. This issue impacts: GlobalProtect app 5.1 versions earlier than GlobalProtect app 5.1.8; GlobalProtect app 5.2 versions earlier than GlobalProtect app 5.2.4.

Overview

State

—

Assigner (CNA)

—

CVSS severity

—

CVSS score

—

CVSS vector

AV:L/AC:L/Au:N/C:N/I:N/A:C

Effective score

5.5 / 10 MEDIUM source: NVD

CWE(s)

—

Reserved

—

Published

2021-04-14 00:00 UTC

Last updated

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Source

https://www.rapid7.com/db/vulnerabilities/palo-alto-networks-globalprotect-app-cve-2021-3038/

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2021-04-20 04:15:12 UTC

NVD last modified

2026-06-17 04:04:36 UTC

NVD CVSS v3.1

5.5 / 10 MEDIUM source: psirt@paloaltonetworks.com

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitability subscore

1.8 / 10

Impact subscore

3.6 / 10

EPSS score

0.0022 (probability of exploitation in next 30 days)

EPSS percentile

12.26% vs all CVEs — higher = more likely to be exploited, as of 2026-06-29

NVD-assigned CWE(s): CWE-20, CWE-248 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2021-26390

Assigner

palo_alto

Published

Apr 20, 2021, 3:15:18 AM

Updated

Sep 16, 2024, 5:49:11 PM

EUVD base score (CVSS 3.1)

5.5 / 10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EUVD-reported EPSS

0.2200

Vendors

Palo Alto Networks

Products

GlobalProtect App (5.1 <5.1.8)

GlobalProtect App (5.2 <5.2.4)

Aliases

GHSA-9x9w-5fmf-qmhj

ENISA description: A denial-of-service (DoS) vulnerability in Palo Alto Networks GlobalProtect app on Windows systems allows a limited Windows user to send specifically-crafted input to the GlobalProtect app that results in a Windows blue screen of death (BSOD) error. This issue impacts: GlobalProtect app 5.1 versions earlier than GlobalProtect app 5.1.8; GlobalProtect app 5.2 versions earlier than GlobalProtect app 5.2.4.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

• https://security.paloaltonetworks.com/CVE-2021-3038 x_refsource_MISC

Web references (6)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• http://cwe.mitre.org/data/definitions/248.html rapid7:cwe.mitre.org
• https://attackerkb.com/topics/CVE-2021-3038 rapid7:attackerkb.com
• http://cwe.mitre.org/data/definitions/20.html rapid7:cwe.mitre.org
• https://security.paloaltonetworks.com/json/CVE-2021-3038 rapid7:security.paloaltonetworks.com
• https://www.cve.org/CVERecord?id=CVE-2021-3038 rapid7:www.cve.org
• https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-26390 rapid7:euvd.enisa.europa.eu

• Update Software, Mitigation M1051 - Enterprise | MITRE ATT&CK®
  web:attack.mitre.org

  This mitigation can be implemented through the following measures: Regular Operating System Updates Implementation: Apply the latest Windows security updates monthly using WSUS (Windows Server Update Services) or a similar patch management solution. Configure systems to check for updates automatically and schedule reboots during maintenance ...

  2026-06-04 07:41 UTC
• ‎Google Gemini
  web:gemini.google.com

  Meet Gemini, Google's AI assistant. Get help with writing, planning, brainstorming, and more. Experience the power of generative AI.

  2026-06-04 07:41 UTC
• Patch Compliance and Remediation: Technical Guide for IT Pros - JumpCloud
  web:jumpcloud.com

  Master patch compliance with this technical guide covering vulnerability scanning, deployment processes, key metrics, and remediation best practices.

  2026-06-04 07:41 UTC
• Security Update Guide - Microsoft
  web:msrc.microsoft.com

  The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

  2026-06-04 07:41 UTC
• NVD - Home
  web:nvd.nist.gov

  The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...

  2026-06-04 07:41 UTC
• Android Security Bulletins - Android Open Source Project
  web:source.android.com

  This Section contains the available Android Security Bulletins, which provide fixes for possible issues affecting Android devices.

  2026-06-04 07:41 UTC
• Determine Fix for IOS XE Software Web UI - Cisco
  web:www.cisco.com

  This document describes a list of software versions that have incorporated fixes for Cisco IOS® XE Software Web UI Cisco bug ID CSCwh87343.

  2026-06-04 07:41 UTC
• What To Do If You Can't Patch A Software Vulnerability - Forbes
  web:www.forbes.com

  Mitigation Measures To Take If Patching Isn't Possible Assuming a patch can't be promptly applied, what can be done to mitigate risk? There are several important measures to keep in mind:

  2026-06-04 07:41 UTC
• Oracle Critical Patch Update Advisory - October 2025
  web:www.oracle.com

  This Critical Patch Update contains 374 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at October 2025 Critical Patch Update: Executive Summary and Analysis.

  2026-06-04 07:41 UTC
• Patch Tuesday June 2026: Security Updates & CVE Analysis
  web:zecurit.com

  Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

  2026-06-04 07:41 UTC

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