CVE-2021-47969 Color Notes 1.4 Denial of Service via Long Character String
Attackers can crash the Color Notes application by pasting excessively long character strings into note fields, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47969?
CVE-2021-47969 is a high-severity denial of service vulnerability in color-notes Color Notes, published on 16 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-789
Which versions are affected by CVE-2021-47969?
How do I fix CVE-2021-47969?
No fix has been published for CVE-2021-47969 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-47969 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47969 exists.
Sources
Also known as GHSA-f83w-w68r-f82v.