Quick answers
- Is CVE-2021-47944 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2021-47944 being exploited in the wild.
- How severe is CVE-2021-47944?
- High severity, with a CVSS score of 7.5, published 10 May 2026.
- Which products and versions are affected?
- memono Notepad 4.2.
- Is there a fix for CVE-2021-47944?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2021-47944 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2021-47944?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A denial of service vulnerability exists in memono Notepad 4.2 for iOS due to improper handling of large memory allocations (CWE-789). The application fails to adequately validate the length of input when text is pasted into a note field. An attacker can trigger an application crash by pasting a buffer of approximately 700,000 characters (e.g., two instances of a 350,000-character string) into a new note. This local exploit was verified on iOS 14.2. While some sources list a network attack vector, the primary exploitation method requires local user interaction to paste the malicious payload.
Affected products
- memono Notepad 4.2
Timeline
- 2021-06-09: disclosed: Initial discovery and PoC by Geovanni Ruiz
- 2026-05-10: advisory: NVD/VulnCheck advisory published