What’s Vulnerable › Vulnerabilities

CVE-2021-47970: Macaron Notes 5.5 Denial of Service via Buffer Overflow

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-16 · updated 2026-06-17
• Weakness: CWE-789

Description

Macaron Notes 5.5 contains a denial of service vulnerability that allows attackers to crash the application by creating notes with excessively long character strings. Attackers can generate a payload containing 350000 repeated characters and paste it into a note field to trigger application crash and stop functionality.

Affected products

• Macaron Notes: 5.5

References

• https://www.exploit-db.com/exploits/49953
• https://www.vulncheck.com/advisories/macaron-notes-denial-of-service-via-buffer-overflow

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