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Vulnerabilities

Vulnerability · CVE-2021-47944

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.

Published May 10, 2026 · catalog updated Jul 25, 2026 · memono Notepad 4.2 contains

Check if you run it

No confirmed exploitation is on record for CVE-2021-47944. EPSS is 0.28%. Act only if a listed version of memono Notepad 4.2 contains is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (memono Notepad 4.2 contains).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.28%
Remediation
Not established
Affected products
See sources for product scope

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.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2021-47944

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-47944. EPSS is 0.28%. Act only if a listed version of memono Notepad 4.2 contains is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-789. EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 10, 2026 · NIST NVD

    Detected

    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.

  2. Jul 25, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2021-47944

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-47944

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2021-47944

    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 t

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.