High 7.5Published May 10, 2026

CVE-2021-47944memono Notepad 4.2 Denial of Service via Buffer Overflow

Updated under an hour ago (Oct 28, 2026, 2:20 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for memono Notepad

Exploited in the last 30 days

memono Notepad 4.2 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character buffers 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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

memono Notepad memono:notepad (from the name)	4.2	CNA record

References

References

https://www.exploit-db.com/exploits/49977	exploit
https://www.vulncheck.com/advisories/memono-notepad-denial-of-service-via-buffer-overflow	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.