CVE-2021-47969

HIGH

Color Notes 1.4 Denial of Service via Long Character String

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47969. PoCs published by Geovanni Ruiz.

AI-analyzed exploit summary This PoC demonstrates a Denial of Service (DoS) vulnerability in Color Notes 1.4 for iOS by creating a large payload file (350,000 'A' characters) that crashes the application when pasted into a note. The exploit is straightforward and relies on overwhelming the application's input handling.

Description

Color Notes 1.4 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350,000 repeated characters and paste it twice into a new note to cause the application to stop responding.

Exploits (1)

exploitdb WORKING POC
by Geovanni Ruiz · pythondosios
https://www.exploit-db.com/exploits/49952

This PoC demonstrates a Denial of Service (DoS) vulnerability in Color Notes 1.4 for iOS by creating a large payload file (350,000 'A' characters) that crashes the application when pasted into a note. The exploit is straightforward and relies on overwhelming the application's input handling.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Color Notes 1.4 (iOS)
No auth needed
Prerequisites: Python to generate payload · Access to the Color Notes app on iOS
devstral-2 · analyzed May 16, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit exploit
ExploitDB-49952
https://www.exploit-db.com/exploits/49952
Third Party Advisory third-party-advisory
VulnCheck Advisory: Color Notes 1.4 Denial of Service via Long Character String
https://www.vulncheck.com/advisories/color-notes-denial-of-service-via-long-character-string

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)
color-notes/Color Notes 1.4
Published May 16, 2026
Tracked Since May 16, 2026