CVE-2021-47971CWE-789

My Notes Safe 5.3 Denial of Service via Buffer Overflow

High · published May 16, 2026

CVSS v4.0
8.7
EPSS
0%
Percentile
19.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
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
EPSS
0.00284 · 19.9th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-05-16T15:26Z
EPSS history
Timeline
  • 16 MAY 15:26Z
    My Notes Safe 5.3 Denial of Service via Buffer Overflow
    cvelistv5