Macaron — CraftedSignal Threat Feedhttps://feed.craftedsignal.io/vendors/macaron/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioSat, 16 May 2026 16:20:48 +0000Macaron Notes 5.5 Denial of Service Vulnerability (CVE-2021-47970)https://feed.craftedsignal.io/briefs/2026-05-macaron-notes-dos/Sat, 16 May 2026 16:20:48 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-05-macaron-notes-dos/Macaron Notes 5.5 is vulnerable to a denial-of-service condition (CVE-2021-47970) due to its handling of excessively long character strings in notes, leading to application crashes.Macaron Notes 5.5 is susceptible to a denial-of-service (DoS) vulnerability (CVE-2021-47970) that can be triggered by an attacker providing an excessively long string of characters within a note. This can be achieved by generating a string of approximately 350,000 repeated characters and pasting it into a note field within the application. Successful exploitation leads to the application crashing and becoming unresponsive. This vulnerability poses a risk to users who rely on the availability and stability of Macaron Notes for their note-taking and organizational needs. By exploiting this vulnerability, an attacker can disrupt the normal functioning of the application, potentially leading to data loss or user frustration.

Attack Chain

  1. An attacker identifies a target user or system running Macaron Notes 5.5.
  2. The attacker crafts a malicious payload consisting of a very long string (e.g., 350,000 characters).
  3. The attacker opens the Macaron Notes application.
  4. The attacker creates a new note or modifies an existing note.
  5. The attacker pastes the oversized string into the note’s content field.
  6. The application attempts to process the excessively large input.
  7. Due to insufficient input validation or memory allocation, the application becomes unresponsive.
  8. The Macaron Notes application crashes, resulting in a denial of service.

Impact

The successful exploitation of CVE-2021-47970 results in a denial-of-service condition, causing the Macaron Notes 5.5 application to crash. This can lead to data loss if users have unsaved changes. The impact is primarily on individual users of the application who may experience disruption and inconvenience. The vulnerability is rated as HIGH severity with a CVSS v3.1 score of 7.5.

Recommendation

  • Deploy the Sigma rule “Detect Macaron Notes Long String DoS Attempt” to detect potential attempts to exploit CVE-2021-47970 in application logs.
  • Monitor application logs for unusually long strings being processed by Macaron Notes using the “Detect Macaron Notes Crash” Sigma rule, and investigate any anomalies.
  • Consider contacting the vendor for a patch or upgrade to a version of Macaron Notes that addresses CVE-2021-47970.
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