What is CVE-2021-47971?

CVE-2021-47971 is a high-severity vulnerability in My-notes-safe My Notes Safe, classified under CWE-789. CVSS score: 7.5/10. Published 2026-05-16.

How severe is CVE-2021-47971?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in My-notes-safe My Notes Safe

CVE-2021-47971

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 charact…

EPSS: 0.001 (16.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

My-notes-safe My Notes Safe — versions 5.3

Weakness classification (CWE)

CWE-789

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2021-47971?: CVE-2021-47971 is a high-severity vulnerability in My-notes-safe My Notes Safe, classified under CWE-789. CVSS score: 7.5/10. Published 2026-05-16.
How severe is CVE-2021-47971?: High severity. CVSS v3 base score is 7.5 out of 10.