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CVE-2021-47971

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cve id
CVE-2021-47971
published
2026-05-16T16:16:22.463
last modified
2026-05-16T16:16:22.463
status
Received
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.
cvss score
7.5
cvss severity
HIGH
cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cwes
CWE-789
cpe count
0
Verify at NIST National Vulnerability Database ↗

Cite this record

CVE-2021-47971 — HIGH. NIST, via Voidly Atlas — Surveillance & Digital-Rights Watch. Retrieved 2026-06-07, https://voidly.ai/atlas/federal/nvd-cves/CVE-2021-47971

@misc{voidly_nvd_cves_CVE202147971,
  title        = {CVE-2021-47971 — HIGH},
  author       = {{Voidly}},
  howpublished = {\url{https://voidly.ai/atlas/federal/nvd-cves/CVE-2021-47971}},
  note         = {Source: NIST National Vulnerability Database, https://nvd.nist.gov/vuln/detail/CVE-2021-47971. Public domain (17 U.S.C. §105); re-surfaced under CC BY 4.0},
  urldate      = {2026-06-07},
  year         = {2026}
}

Also available as JSON/BibTeX/APA: API record. Source data is U.S. federal public domain (17 U.S.C. §105). Re-surfaced by Voidly under CC BY 4.0.