CVE-2021-47971

My Notes Safe 5.3 Denial of Service via Buffer Overflow

CVSS 8.7 HIGHEPSS 0.3%CWE-789

Vexday Risk Score

41Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 8.7EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

16 May 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings 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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected products

my-notes-safe · My Notes Safe

public PoCs found — 1

cve_referencewww.exploit-db.com/exploits/49954unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

https://www.exploit-db.com/exploits/49954 https://www.vulncheck.com/advisories/my-notes-safe-denial-of-service-via-buffer-overflow