CVE-2021-47944

HIGH 7.5

memono Notepad 4.2 Denial of Service via Buffer Overflow

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

12th

memono Notepad 4.2 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character buffers into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash on iOS devices.

CWE	CWE-789
Vendor	memono
Product	notepad
Published	May 10, 2026
Last Updated	May 12, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

memono / Notepad

4.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/49977 vulncheck.com: https://www.vulncheck.com/advisories/memono-notepad-denial-of-service-via-buffer-overflow

Credits

Geovanni Ruiz