CVE-2020-37221CWE-121

Atomic Alarm Clock 6.3 Stack Overflow via SEH Unicode

High · published May 13, 2026

CVSS v4.0
8.6
EPSS
0%
Percentile
4.0
In the wild
Unconfirmed
What it is

Atomic Alarm Clock 6.3 contains a stack overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious string to the display name textbox in the Time Zones Clock configuration. Attackers can craft a buffer with structured exception handling overwrite and encoded shellcode to bypass SafeSEH protections and execute arbitrary commands with application privileges.

The record
Technical detail
CVSS v4.0
8.6 · HIGH
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00152 · 4.0th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2026-05-13T14:22Z
EPSS history
Timeline
  • 13 MAY 14:22Z
    Atomic Alarm Clock 6.3 Stack Overflow via SEH Unicode
    cvelistv5