Vulnerability · Published May 16, 2026 · Assigned by VulnCheck
CVE-2021-47971My Notes Safe 5.3 Denial of Service via Buffer Overflow
High 7.5
In plain English
A high-severity security flaw in My Notes Safe from my-notes-safe. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 78.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
My Notes Safe 5.3 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| my-notes-safe | My Notes Safe | 5.3 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- ExploitDB-49954 exploit
- VulnCheck Advisory: My Notes Safe 5.3 Denial of Service via Buffer Overflow third-party-advisory