Denial of Service Vulnerability in Color Notes by Color Notes App
CVE-2021-47969

8.7HIGH

Key Information:

Vendor

Color-notes

Status
Color Notes
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47969?

Color Notes version 1.4 is susceptible to a denial of service attack. This vulnerability allows an attacker to crash the application by inputting excessively long character strings into note fields. By generating a payload of 350,000 repeated characters and pasting it into a new note twice, an attacker can render the application unresponsive, disrupting user access and functionality.

Affected Version(s)

Color Notes 1.4

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-2021-47969 - Proof of Concept

References

https://www.exploit-db.com/exploits/49952
exploit
https://www.vulncheck.com/advisories/color-notes-denial-o...
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
.