CVE-2021-47970

Description

Macaron Notes 5.5 contains a denial of service vulnerability that allows attackers to crash the application by creating notes with excessively long character strings. Attackers can generate a payload containing 350000 repeated characters and paste it into a note field to trigger application crash and stop functionality.

Overview

State

—

Assigner (CNA)

—

CVSS severity

high

CVSS score

7.5 / 10

CVSS vector

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

Effective score

7.5 / 10 HIGH source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2021-47970

Linked Threat

CVE-2021-47970 — CVE-2021-47970

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

2026-05-16 16:16:22 UTC

NVD last modified

2026-05-18 17:32:04 UTC

NVD CVSS v3.1

7.5 / 10 HIGH source: disclosure@vulncheck.com

NVD CVSS vector

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

Exploitability subscore

3.9 / 10

Impact subscore

3.6 / 10

EPSS score

0.0005 (probability of exploitation in next 30 days)

EPSS percentile

16.41% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-789 (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-2021-34829

Assigner

VulnCheck

Published

May 16, 2026, 3:26:11 PM

Updated

May 25, 2026, 11:41:18 PM

EUVD base score (CVSS 4.0)

8.7 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EUVD-reported EPSS

0.0500

Vendors

macaron-notes-great-notebook, Macaron Notes

Products

Macaron Notes Gear Notebook (5.5)

Macaron Notes (5.5)

Aliases

GHSA-4439-4hh6-5j2w

ENISA description: Macaron Notes 5.5 contains a denial of service vulnerability that allows attackers to crash the application by creating notes with excessively long character strings. Attackers can generate a payload containing 350000 repeated characters and paste it into a note field to trigger application crash and stop functionality.

Vendor references (0)

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

None in the CVE record.

Web references (5)

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

• https://nvd.nist.gov/vuln/detail/CVE-2021-47970 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2021-47970 tenable:www.cve.org
• https://www.exploit-db.com/exploits/49953 tenable:www.exploit-db.com
• https://www.first.org/epss/ tenable:www.first.org
• https://www.vulncheck.com/advisories/macaron-notes-denial-of-service-via-buffer-overflow tenable:www.vulncheck.com

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

• Chrome Releases: Stable Channel Update for Desktop
  web:chromereleases.googleblog.com

  Note: Access to bug details and links may be kept restricted until a majority of users are updated with a fix . We will also retain restrictions if the bug exists in a third party library that other projects similarly depend on, but haven't yet fixed. This update includes 21 security fixes. Please see the Chrome Security Page for more information.

  2026-05-26 02:55 UTC
• CISA Warns of Exploited Microsoft Defender 0-Day Flaws
  web:cyberpress.org

  The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026.

  2026-05-26 02:55 UTC
• A new and improved community patch for BO3. - GitHub
  web:github.com

  A new and improved community patch for BO3. . Contribute to shiversoftdev/t7patch development by creating an account on GitHub.

  2026-05-26 02:55 UTC
• KB5081477 - Cumulative Update 25 for SQL Server 2022
  web:learn.microsoft.com

  This article contains the summary, known issues, improvements, fixes, and other information for SQL Server 2022 Cumulative Update 25 (KB5081477).

  2026-05-26 02:55 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.

  2026-05-26 02:55 UTC
• Google Translate
  web:translate.google.com

  Google's service, offered free of charge, instantly translates words, phrases, and web pages between English and over 100 other languages.

  2026-05-26 02:55 UTC
• CVE: Common Vulnerabilities and Exposures
  web:www.cve.org

  At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures

  2026-05-26 02:55 UTC
• How to Fix the "Your Device Is Missing Important Security and Quality ...
  web:www.howtogeek.com

  In this case, use your PC's built-in Windows Update troubleshooter to automatically find and fix issues with your updates. Only a little interaction is required from your end. To run that tool, go to Settings > Update & Security > Troubleshoot > Additional Troubleshooters > Windows Update and click "Run the Troubleshooter".

  2026-05-26 02:55 UTC
• Windows 11 KB5083769 April 2026 update triggers death loops and BSODs
  web:www.notebookcheck.net

  Microsoft's Windows 11 KB5083769 April 2026 update causes critical boot failures, pixelated BSODs, and BitLocker recovery loops on Windows 11 24H2 and 25H2 PCs.

  2026-05-26 02:55 UTC
• Oracle Critical Patch Update Advisory - April 2026
  web:www.oracle.com

  This Critical Patch Update contains 481 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 April 2026 Critical Patch Update: Executive Summary and Analysis.

  2026-05-26 02:55 UTC

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