Denial of Service Vulnerability in Macaron Notes by Macaron
CVE-2021-47970

8.7HIGH

Key Information:

Vendor

Macaron-notes-great-notebook

Status
Macaron Notes Gear Notebook
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47970?

Macaron Notes version 5.5 is susceptible to a denial of service vulnerability due to improper handling of input. Attackers can exploit this by creating notes that contain excessively long character strings, which can reach up to 350,000 repeated characters. This exploit results in the application crashing, disrupting functionality and potentially leading to a denial of service for legitimate users. Organizations using this product should take immediate action to mitigate this vulnerability.

Affected Version(s)

Macaron Notes Gear Notebook 5.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47970 - Proof of Concept

References

https://www.exploit-db.com/exploits/49953
exploit
https://www.vulncheck.com/advisories/macaron-notes-denial...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Geovanni Ruiz
.