CVE-2021-47970

HIGH

Macaron Notes 5.5 Denial of Service via Buffer Overflow

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47970. PoCs published by Geovanni Ruiz.

AI-analyzed exploit summary This PoC demonstrates a DoS vulnerability in Macaron Notes by generating a large payload (350,000 'A' characters) that crashes the application when pasted into a note. The exploit is straightforward and targets a buffer overflow or memory handling issue.

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.

Exploits (1)

exploitdb WORKING POC
by Geovanni Ruiz · pythondosios
https://www.exploit-db.com/exploits/49953

This PoC demonstrates a DoS vulnerability in Macaron Notes by generating a large payload (350,000 'A' characters) that crashes the application when pasted into a note. The exploit is straightforward and targets a buffer overflow or memory handling issue.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Macaron Notes great notebook 5.5
No auth needed
Prerequisites: Python to generate payload · Macaron Notes installed on iOS
devstral-2 · analyzed May 16, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit exploit
ExploitDB-49953
https://www.exploit-db.com/exploits/49953
Third Party Advisory third-party-advisory
VulnCheck Advisory: Macaron Notes 5.5 Denial of Service via Buffer Overflow
https://www.vulncheck.com/advisories/macaron-notes-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 (2)
Macaron Notes/Macaron Notes 5.5
macaron-notes-great-notebook/Macaron Notes Gear Notebook 5.5
Published May 16, 2026
Tracked Since May 16, 2026