CVE-2021-47973 Sticky Notes Widget 3.0.6 Denial of Service via Buffer Overflow
Attackers can crash the iOS Sticky Notes Widget application by pasting excessively long character strings into note fields.
- 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-2021-47973?
CVE-2021-47973 is a high-severity denial of service vulnerability in sticky-notes Sticky Notes Widget, published on 16 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Sticky Notes Widget 3.0.6 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 350000 repeated characters and paste it twice into a new note to trigger an application crash on iOS devices.
Weakness: CWE-789
Which versions are affected by CVE-2021-47973?
How do I fix CVE-2021-47973?
No fix has been published for CVE-2021-47973 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-2021-47973 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47973 exists.
Sources
Also known as GHSA-cf4r-4q6g-m584.