HOMEVULNERABILITIESCVE-2021-47969
HIGH

CVE-2021-47969

CWE-789Published: May 16, 2026· Updated: May 18, 2026

7.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:12.0th

Official 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.

NVD Source

Technical Analysis

CVE-2021-47969 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

All References (2)

→
https://www.exploit-db.com/exploits/49952
→
https://www.vulncheck.com/advisories/color-notes-denial-of-service-via-long-character-string

Quick Facts

CVE IDCVE-2021-47969
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-789
CISA KEVNo
EPSS (30d)0.04%
PublishedMay 16, 2026

Related CVEs (CWE-789)

CVE-2026-28253
8.7
CVE-2026-20048
7.7
CVE-2021-47973
7.5
CVE-2026-8485
7.5
CVE-2021-47971
7.5
CVE-2026-39312
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-47969 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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