CVE-2021-47944

HIGH

memono Notepad 4.2 Denial of Service via Buffer Overflow

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47944. PoCs published by Geovanni Ruiz.

AI-analyzed exploit summary This PoC exploits a DoS vulnerability in memono Notepad 4.2 by generating a large payload (350,000 'A' characters) that crashes the application when pasted into a note. The exploit is straightforward and demonstrates the vulnerability effectively.

Description

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.

Exploits (1)

exploitdb WORKING POC
by Geovanni Ruiz · pythonlocalios
https://www.exploit-db.com/exploits/49977

This PoC exploits a DoS vulnerability in memono Notepad 4.2 by generating a large payload (350,000 'A' characters) that crashes the application when pasted into a note. The exploit is straightforward and demonstrates the vulnerability effectively.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: memono Notepad Version 4.2 (iOS)
No auth needed
Prerequisites: Python to generate payload · memono Notepad installed on iOS
devstral-2 · analyzed May 10, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit exploit
ExploitDB-49977
https://www.exploit-db.com/exploits/49977
Third Party Advisory third-party-advisory
VulnCheck Advisory: memono Notepad 4.2 Denial of Service via Buffer Overflow
https://www.vulncheck.com/advisories/memono-notepad-denial-of-service-via-buffer-overflow

Scores

CVSS v3 7.5
EPSS 0.0028
EPSS Percentile 19.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-789
Status published
Products (1)
memono/Notepad 4.2
Published May 10, 2026
Tracked Since May 10, 2026