CVE-2021-47944Public exploit

Application crash via unbounded note paste

Published May 10, 2026 · Updated May 10, 2026

Denial of service in memono Notepad 4.2 allows attackers to crash the iOS application by pasting oversized text into a new note. The note editor accepts two pastes of a 350,000-character buffer without a length limit and terminates after excessive memory allocation. Exploitation requires local interaction; App Store identifier 906470619 belongs to Dennis Ebbinghaus, not Adylitica's Memo Notepad.

CVSS severity8.7
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in memono Notepad 4.2 allows attackers to crash the iOS application by pasting oversized text into a new note. The note editor accepts two pastes of a 350,000-character buffer without a length limit and terminates after excessive memory allocation. Exploitation requires local interaction; App Store identifier 906470619 belongs to Dennis Ebbinghaus, not Adylitica's Memo Notepad.

The record

CVE
CVE-2021-47944
Published
May 10, 2026
Updated
May 10, 2026
Vendor
Adylitica
Product
Memo Notepad
Classifications
CWE-789, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2026CVE publishedPublication date reported by the CVE source.
  2. May 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adylitica · Memo Notepadversion=4.2

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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